51 Wetland Birds of Maryland: ID, Habitat, & Sounds Guide

Discover the wetland birds of Maryland with this essential identification guide. Featuring 51 species plates. To simplify bird ID across the Old Line State, we categorize resident and migrant birds by size—from massive cranes to secretive rails. Learn to recognize key traits, habitats, and behavior in Maryland’s marshes and swamps.

How to use this Guide

Click on any of the four size groups below (Crane, Stork, Egret, and Gallinule) to explore the species included in the category. You can also use the Table of Contents below this section to browse the entire guide.

While weight offers a useful starting point, appearances can be deceiving—plumage, body shape, and leg length often make a bird look larger or smaller than its true size.

Maryland Wetlands

Maryland contains approximately 242,811 hectares (600,000 acres) of wetlands, which account for about 9.5% of the state’s total land area. 

• Diverse Ecosystems: Maryland’s wetlands are primarily comprised of two main types: 57.3% are freshwater (palustrine) wetlands, such as forested swamps, while 42% are estuarine (salt and brackish) wetlands located along the Chesapeake Bay and coastal regions.
• Avian Importance: These habitats are critical for avian life, as 80% of America’s breeding bird population and more than 50% of protected migratory species rely on wetlands during their life cycles.

Waterfowl Sanctuary: Maryland’s wetlands, particularly within the National Wildlife Refuge System, are strategic locations that support millions of ducks and other waterfowl that breed or overwinter in the region.

Wetlands constitute less than 5% of the land area of the contiguous United States.

More about wetlands: Understanding Wetlands: An Overview for State Bird Guides

Birds of Maryland’s Marshes, Swamps, and Coastal Wetlands

This guide highlights the 51 bird species most closely tied to Maryland’s water systems. It features classic wading species—herons, egrets, and ibises—along with other wetland regulars like loons, grebes, coots, rails, and snipes.

While these species are the focus of this guide, they are rarely the only birds you’ll find in the marsh. For a broader overview of the species commonly seen in open water, shallows, and grassy edges, explore our Guide to the Ducks, Geese, and Swans of Maryland.

The breakdown of wetland birds by group is as follows:

• Herons, Egrets, and Bitterns: This group contains 13 species, representing approximately 25% of the total.
• Rails, Coots, Gallinules, and Swamphens: This group contains 9 species, representing approximately 17.3% of the total.
• Gulls & Terns: This group contains 6 species, representing approximately 11.5% of the total.
• Grebes: This group contains 4 species, representing approximately 7.7% of the total.
• Raptors (Hawks, Kites, Eagles, Osprey): This group contains 3 species, representing approximately 5.8% of the total.
• Pelicans, Cormorants, and Anhinga: This group contains 3 species, representing approximately 5.8% of the total.
• Ibises: This group contains 2 species, representing approximately 3.8% of the total.
• Wood Stork & Spoonbills: This group contains 2 species, representing approximately 3.8% of the total.
• Loons: This group contains 2 species, representing approximately 3.8% of the total.
• Avocets and Stilts: This group contains 2 species, representing approximately 3.8% of the total.
• Snipe & Woodcock: This group contains 2 species, representing approximately 3.8% of the total.
• Blackbirds: This group contains 2 species, representing approximately 3.8% of the total.
• Single-Entry Species: The Sandhill Crane, Limpkin, Belted Kingfisher, and Killdeer are represented by a single entry each, collectively making up the remaining 7.7% of the list.

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Very Large Wetland Birds of Maryland (>10 lb)

This category includes the true giants of Texas’ wetlands. Though few in number, these species command attention with their size, broad wingspans, and body mass. Individuals in this group range from approximately 11 to over 16 pounds, making them the heaviest regularly occurring wetland birds in the state. Their size, slow wingbeats, and visual presence distinguish them clearly from all other waterbirds.

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American White Pelican

Silent

Identification: Adult: Snowy white with black flight feathers visible in flight. Yellow-orange bill and legs; breeding adults show a yellow chest patch and grow a bill horn. Immature: Mostly white with dusky head, neck, and back.
Habitat: The American White Pelican (Pelecanus erythrorhynchos) forages in shallow inland marshes, lake and river edges, estuaries, sloughs, and inlets.
Status and Movements: The American White Pelican is an uncommon transient and nonbreeding visitor in Maryland, typically seen on large bodies of water during spring and fall migration, sometimes lingering into summer.
Behavior: Forages by dipping bill at the water’s surface to scoop fish; also upends like dabbling ducks. Known for cooperative foraging, driving fish toward shore. Highly gregarious.
Diet: Primarily small fish, but also salamanders, tadpoles, crayfish, and game fish.
Nest: A shallow depression on the ground, sometimes lined with vegetation. Nests in colonies.
Breeding: Season: April-late August | Clutch: 2 chalky white eggs | Incubation: ~30 days | Nestling period: 63–70 days.
Lifespan: At least 23 years, 6 months.
How many are there? Global population estimated at ~450,000.
Conservation Status: Low conservation concern.

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Sandhill Crane

Identification: Adult: Slate gray with rusty wash, pale cheek, red crown, black legs. Juvenile: Gray and rusty brown, lacking pale cheek and red crown.
Habitat: The Sandhill Crane (Antigone canadensis) forages in open wetlands, prairies, bogs, lakes, croplands.
Status and Movements: The Sandhill Crane is an increasingly common transient and winter visitor in Maryland. Flocks are observed during fall and spring migration, with some individuals overwintering in agricultural fields.
Behavior: Forages for food by gleaning/probing. Social. Pairs perform elaborate dances.
Diet: Sandhill cranes feed on invertebrates, small vertebrates, seeds, berries, tubers.
Nest: Cup-shaped structure of dominant vegetation, 30–40 in across, on the ground.
Breeding: Season: Jan to May. Breeding age: 2–7 years | Clutch: 1–3 pale brownish yellow/gray markings eggs | Broods: 1 | Incubation: 29–32 days | Offspring dependency: 9–10 months.
Lifespan: At least 37 years, 3 months.
How many are there? In Floria there are about 4,500 resident and 25,000 migratory Sandhill Cranes.
Conservation Status: Low concern.

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Common Loon

Identification: Breeding: black head, spotted back, white breast. Nonbreeding: gray back/head, white throat. Juvenile: like nonbreeding with scalloping. Large, rounded head, dagger-like bill.
Habitat: The Common Loon (Gavia immer) favors clear freshwater lakes, ponds, islands, seacoasts, reservoirs, estuaries, rivers.
Status and Movements: The Common Loon is a common winter visitor and transient in Maryland. It arrives in late fall, frequenting coastal waters and large reservoirs, departing for northern breeding grounds by late spring.
Behavior: Stealthy divers, catch fish underwater. Monogamous pairs; vocal nocturnal choruses. Males yodel for territory.
Diet: Common loons feed on fish, perch, sunfish, croaker, silversides, crustaceans, snails, leeches, aquatic insect larvae.
Nest: Mound of dead sedges and grasses on protected lakeshores or islands near water.
Breeding: Season: May-Oct | Clutch: 1-2 brown, with dark splotches eggs | Broods: 1 | Incubation: 26-29 days | Nestling: 1-2 days.
Lifespan: At least 29 years, 10 months.
How many are there: There are ~1.2 million Common Loons globally.
Conservation Status: Low Concern.

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Large-Wetland-Birds of Maryland (5-10 lb)

This category includes four species weighing between approximately 5 and 10 pounds. Members of this group are substantial in size and often appear even larger due to elongated legs and tall, upright posture. Their height and broad wingspans contribute to a strong visual presence in wetland habitats, placing them clearly above medium-sized species but below the heaviest wetland birds in the state.

Bald Eagle

Identification: Striking white head and tail contrasting with a dark brown body and wings, plus yellow legs and bill. Immatures are dark with mottled brown-and-white, and take about five years to acquire full adult plumage.
Habitat: The Bald Eagle (Haliaeetus leucocephalus) is found in forests near large bodies of water with tall mature trees for nesting. In winter, they use dry open uplands as well.
Status and Movements: The Bald Eagle is a common resident throughout Maryland. This iconic raptor breeds locally and can be observed year-round, particularly along major waterways and coastal areas.
Behavior: Powerful fliers that hunt, steal prey from other animals, scavenge carrion, and even feed on garbage.
Diet: Primarily fish, but also birds, reptiles, amphibians, crabs, rabbits, and muskrats.
Nest: Bald Eagles have the largest nests of any North American bird. Nests are placed in tall trees, cliffs, or occasionally on the ground.
Breeding: Season: December-mid-May (South) | Clutch: 1–3 dull white, usually unmarked eggs | Broods: 1 | Incubation: 34–36 days | Nestling period: 56–98 days.
Lifespan: At least 38 years.
How many are there? Over 316,000 individuals in the U.S. Lower 48.
Conservation Status: Low Concern.

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Great Blue Heron

Identification: Largest North American heron with long legs, S-shaped neck, and dagger-like bill. Blue-gray plumage, black eye stripe, and shaggy head. A white morph occurs in the Florida Keys.
Habitat: The Great Blue Heron (Ardea herodias) favors fresh, saltwater, brackish wetlands, ditches, and farmland.
Status and Movements: The Great Blue Heron is a common resident in Maryland. It is present year-round, often seen wading in shallow waters of marshes, ponds, and rivers across the state.
Behavior: Hunts by standing still or stalking in shallow water. Flies with neck tucked and legs trailing. Defends feeding territories.
Diet: Fish, amphibians, reptiles, mammals, insects, and birds. Prey grabbed or impaled with bill.
Nest: Great Blue Herons build a stick platform in trees; also on ground, bushes, or man-made structures. Often in colonies.
Breeding: Season: March–August | Clutch: 2–6 pale blue eggs | Broods: 1–2 | Incubation: 27–29 days | Nestling: 49–81 days.
Lifespan: At least 24 years, 6 months.
How many are there?? About 700,000 globally.
Conservation Status: Stable, low concern.

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Wood Stork

Identification: Large, white wading bird with black flight feathers and tail, bald scaly head, and thick, slightly curved bill.
Habitat: The Wood Stork (Mycteria americana) inhabits marshes, forested wetlands, swamps, and shorelines.
Status and Movements: The Wood Stork is an accidental visitor to Maryland. These southern wading birds are extremely rare, with only a handful of records, usually during late summer post-breeding dispersal.
Behavior: Wood storks feed by probing water and feeling for prey; may startle prey. Social, soars on thermals.
Diet: Fish, aquatic invertebrates, seeds, amphibians, nestlings, reptiles.
Nest: Large stick structure in trees above standing water, lined with greenery, secured with guano; in colonies.
Breeding: Season: December-August | Clutch: 1–5 creamy white eggs | Broods: 1 | Incubation: 28 and 32 days | Nestling: 50 days.
Lifespan: At least 22 years, 6 months.
How many are there? The U.S. Wood Stork population has rebounded from about 5,000 nesting pairs in the 1970s to over 11,000 pairs by early 2023.
Conservation Status: Low concern.

Medium-sized Wetland Birds of Maryland (3.7–1 lb)

This group includes species that fall within an intermediate weight range of approximately 3.7 to 1 pound. It represents one of the most diverse and potentially confusing size categories, as body shape and structure vary considerably within the same weight bracket. Some species appear large and long-limbed, while others are compact and low-profile, creating notable contrasts despite overlapping weights.

Double-crested Cormorant

Identification: Adult: Brown-black plumage, yellow-orange facial skin. Breeding adults show double crests (black/white). Immatures browner, with pale neck/breast.
Habitat: The Double-crested Cormorant (Nannopterum auritum) favors freshwater and saltwater habitats, coasts, large inland lakes.
Status and Movements: The Double-crested Cormorant is a common resident, transient, and summer visitor in Maryland. It is abundant year-round, especially along coastal waters, rivers, and large lakes.
Behavior: Dives to catch small fish, spreads wings to dry. Flies in V-shaped flocks, nests colonially.
Diet: Double-crested Cormorants feed on mainly small fish.
Nest: Bulky stick nest, often in tree colonies.
Breeding: Season: Varies in every region | Clutch: 1-6 unmarked pale blue eggs | Broods: 1-2 | Incubation: 25-28 days | Nestling: 21-28 days.
Lifespan: At least 23 years, 8 months.
How many are there? Abundant.
Conservation Status: Low concern.

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Osprey

Identification: Dark brown upperparts, white underparts. White head marked with a bold brown eye stripe. Juveniles have white spots on the back and buff-tinted breast shading.
Habitat: Ospreys (Pandion haliaetus) inhabit open waters with abundant fish; plus elevated nesting sites.
Status and Movements: The Osprey is a common summer resident and transient in Maryland. Arriving in early spring, it breeds extensively along waterways, departing for southern wintering grounds by early fall.
Behavior: Hunts live fish by hovering and diving feet-first. Mostly solitary; males perform aerial “sky-dance” displays.
Diet: Ospreys feed almost exclusively live fish (99%), occasionally fish remains, birds, snakes, voles, squirrels.
Nest: Large, untidy stick platforms, often on poles, snags, dead trees, or artificial platforms.
Breeding: Season: mid April-early September | Breeds spring–fall | Clutch: 1–4 cream spotted with reddish eggs | Broods: 1 | Incubation: 36–42 days | Nestling period: 50–55 days.
Lifespan: At least 25 years, 2 months.
How many are there? ~1.2 million global breeding population.
Conservation Status: Low Concern.

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Roseate Spoonbill

Identification: Adult: Bright pink, partly bald head, white neck, and long spoon-shaped bill. Pink shoulders. Juvenile: Paler pink, fully feathered head until age 3.
Habitat: The Roseate Spoonbill (Platalea ajaja) lives in shallow fresh, brackish, and marine waters. Nests/roosts in trees or shrubs along water.
Status and Movements: The Roseate Spoonbill is an accidental visitor to Maryland. This distinctive wading bird is extremely rare, with only a few records, typically during late summer post-breeding dispersal events.
Behavior: Forages by sweeping bill side-to-side in shallow water. Usually in flocks, often with other waders.
Diet: Roseate Spoonbill feed on shrimp, aquatic insects, and fish.
Nest: Bulky stick platform lined with moss or bark strips, built in trees/shrubs over water.
Breeding: Season: April-Mid August. Clutch: 1–5 whitish to pale green with brown spots eggs | Broods: 1 | Incubation: 22 days | Nestling: 35–42 days.
Lifespan: At least 15 years, 10 months.
How many are there? There are approximately 11,000 Roseate Spoonbills in the U.S.
Conservation Status: Low concern.

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Red-throated Loon

Identification: Breeding: gray neck, rusty throat patch, black-and-white neck stripes. Nonbreeding: blackish above, white face/underparts. Juvenile: grayish brown above, pale below. Slender with bill tipped upward.
Habitat: The Red-throated Loon (Gavia stellata) favors tundra, taiga lakes, marine coasts, large lakes, bays, estuaries, sounds, shallow coastal waters.
Status and Movements: The Red-throated Loon is an uncommon winter visitor and transient in Maryland. It frequents coastal bays and offshore waters from late fall through early spring, often seen singly.
Behavior: Dives for fish; scans underwater by dipping head. Highly mobile; social during migration, forming large flocks.
Diet: Red-throated loons feed on fish, leeches, copepods, crustaceans, mollusks, squid, polychaete worms, aquatic insects.
Nest: Mounds of moss, mud, and vegetation built on shorelines or shallow water of small ponds.
Breeding: Season: May-Sep | Clutch: 1-2 brown to olive, speckled eggs | Broods: 1 | Incubation: 24-31 days | Nestling: <1 day.
Lifespan: At least 23 years and 7 months.
How many are there: Estimated global breeding population is ~260,000.
Conservation Status: Low Concern.

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Anhinga

Identification: Spear-like bill. Adult males black with silvery-white streaks on back/wings. Females/immatures have pale tan head, neck, breast.
Habitat: The Anhinga (Anhinga anhinga) favors shallow freshwater lakes, ponds, brackish bays; prefers perches for drying.
Status and Movements: The Anhinga is a rare summer visitor and accidental species in Maryland. Most sightings occur during warmer months, typically in southern parts of the state’s freshwater wetlands.
Behavior: Anhingas forage by stalking and spearing fish underwater. Nests in loose groups with other waterbirds.
Diet: Small to medium wetland fishes, crustaceans, invertebrates.
Nest: Bulky stick platform in trees near/over water; lined with leaves/twigs.
Breeding: Season: February-October | Clutch: 2–5 pale bluish green, chalky coating eggs | Broods: 1 | Incubation: 26–30 days | Nestling: 14–21 days.
Lifespan: At least 12 years.
How many are there? Global breeding population ~2 million.
Conservation Status: Low Concern.

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Red-necked Grebe

Identification: Breeding adults: brick red neck, black crown, white cheeks, yellow bill. Nonbreeding: dark gray above, pale cheeks. Juveniles: similar to nonbreeding with less distinct head pattern.
Habitat: The Red-necked Grebe (Podiceps grisegena) favors shallow freshwater lakes, ponds, bogs, marshes, rivers, bays, ocean coastlines.
Status and Movements: The Red-necked Grebe is a rare winter visitor and transient in Maryland. It occurs primarily on coastal bays and large inland lakes from late fall through early spring.
Behavior: Forages by surface diving. Solitary or small groups in winter; pairs are vocal and territorial during nesting.
Diet: Red-necked grebes feed on fish, crustaceans, insects, salamanders, frogs, tadpoles, amphipods, leeches, crayfish, clams, spiders.
Nest: Bulky pile of aquatic plants floating or anchored to bottom or vegetation.
Breeding: Season: Late Apr-early Sep | Clutch: 4-5 white-bluish eggs | Broods: 1 | Incubation: 27-28 days | Nestling: <1 day.
Lifespan: At least 11 years.
How many are there?: Global breeding population of ~160,000.
Conservation Status: Low Concern.

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Limpkin

Identification: Heron-sized, brown with heavy white spangling; long bill, often curved right.
Habitat: The Limpkin (Aramus guarauna) inhabits shallow freshwater swamp forests, marshes, ditches, lakes, and wet sugarcane fields.
Status and Movements: The Limpkin is an accidental visitor to Maryland. This southern wetland bird is exceedingly rare, with only a handful of records, usually during late summer post-breeding dispersal.
Behavior: Limpkins forages day and night, stalking and probing for snails. Swims well.
Diet: Mostly apple snails; also mussels, seeds, insects, lizards, frogs.
Nest: Circular structure of sticks, lined with moss, in marsh grasses or in trees.
Breeding: Season: January-August | Clutch: 4–7 light grayish to olive with streaks/blotches eggs | Broods: 1–3 | Incubation: 26–28 days | Hatchlings: Able to swim, walk, run at hatching.
Lifespan: Not specified.
How many are there? Approximately 3,000–6,000 pairs.
Conservation Status: Low concern.

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American Herring Gull

Identification: Breeding: White head, light gray back, black wingtips with white spots, yellow bill with red spot, pink legs. Nonbreeding: Brown streaking on head and neck. Juvenile: Brown-mottled overall, dark bill, pinkish-brown legs; gradually pales over four years.
Habitat: The Herring Gull (Larus smithsonianus) inhabits coasts, lakes, rivers, estuaries, mudflats, fields, landfills, parking lots.
Status and Movements: The American Herring Gull is a common winter visitor and resident in Maryland. It is abundant year-round, especially along coastal areas, landfills, and large inland waterways.
Behavior: The American Herring Gull forages by scavenging or stealing. Social, found in large flocks and colonies.
Diet: Fish, crustaceans, mollusks, insects, eggs, refuse, carrion.
Nest: Shallow scrape on ground lined with grass, seaweed, or feathers. Breeds in colonies.
Breeding: Breeding Months: Late April-August | Clutch: 1-3 olive, buff, or bluish eggs | Broods: 1 | Incubation: 27-30 days | Nestling: ~5 days.
Lifespan: At least 29 years, 3 months.
How many are there?: There are ~430,000 breeding American Herring Gulls.
Conservation Status: Least Concern.

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White Ibis

Identification: Adult: All white with black wingtips, red/pink legs, face and bill. Juvenile: Brown above, white below, streaked brown neck, orange-pink legs and bill.
Habitat: The White Ibis (Eudocimus albus) inhabits shallow wetlands, swamps, mangroves, flooded pastures, lawns, and parks.
Status and Movements: The White Ibis is a rare summer visitor and accidental species in Maryland. Most sightings occur during warmer months, typically in southern parts of the state’s wetlands.
Behavior: Forages, flies, and nests in flocks. Feeds by walking and probing muddy bottoms.
Diet: Insects, crayfish, earthworms, fish, frogs, lizards, and snails.
Nest: Messy stick platform built in trees or shrubs within colonies. Nest locations change yearly.
Breeding: Season: March-Mid-October | Clutch: 2-4 cream to blue-green with brown splotches eggs | Broods: 1-2 | Incubation: 21-23 days | Nestling: 40–60 days.
Lifespan: At least 16 years, 4 months.
How many are there? Global population is about 2.4 million.
Conservation Status: Low concern

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Black-crowned Night-Heron

Identification: Stocky heron with light-gray body, black back and crown, and all-black bill. Immatures are brown with white spots, streaks, and yellow-and-black bills.
Habitat: The Black-crowned Night-Heron (Nycticorax nycticorax) forages in freshwater, brackish, and saltwater wetlands.
Status and Movements: The Black-crowned Night-Heron is a resident, transient, and summer visitor in Maryland. It breeds locally and can be found year-round, especially in coastal marshes and wetlands.
Diet: The Black-crowned Night-Heron feeds on fish, frogs, insects, small mammals, birds, carrion, plant matter, and garbage.
Nest: Stick platform in trees, shrubs, or cattails; nests colonially.
Breeding: Season: January-August | Clutch: 3–5 greenish-blue eggs | Incubation: 24–26 days | Nestling: 29–34 days.
Lifespan: Up to 21 years, 5 months.
How many are there? About 3 million globally.
Conservation Status: Low concern.

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American Coot

Identification: Adult: Plump, chickenlike, dark gray to black, bright white bill and forehead, small red forehead patch. Juvenile/nonbreeding: Duller gray with less distinct forehead patch.
Habitat: The American Coot (Fulica americana) prefers freshwater wetlands with emergent vegetation. Also found anywhere with standing water; ponds, city parks.
Status and Movements: The American Coot is a common winter visitor and transient in Maryland. It arrives in fall, frequenting freshwater ponds and marshes, departing for northern breeding grounds by spring.
Behavior: The American Coot forages by plucking plants while walking, swimming, dabbling, or diving. Highly social in winter.
Diet: Primarily aquatic plants. Also takes insects, snails, tadpoles, and salamanders.
Nest: Floating platform anchored to emergent vegetation, woven into a shallow basket over water.
Breeding: Season: May-mid-August | Clutch: 8–12 buff with dark speckles eggs | Broods: 1–2 | Incubation: 23–25 days | Chicks: Down-covered, alert, leave nest within 6 hours.
Lifespan: At least 22 years, 4 months.
How many are there? Global breeding population about 7.1 million individuals.
Conservation Status: Low conservation concern.

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Yellow-crowned Night-Heron

Identification: Medium heron with cloudy gray plumage, black head, creamy yellow crown, and white cheek patches. Immatures are brown with fine white spots and streaked underparts.
Habitat: The Yellow-crowned Night-Heron forages (Nyctanassa violacea) in coastal wetlands; also inland in swamps, and wet fields.
Status and Movements: The Yellow-crowned Night-Heron is an uncommon summer resident in Maryland, arriving in spring and departing by early fall.
Diet: The Yellow-crowned Night-Heron feeds primarily on small crabs and crayfish; also fish, snakes, and small mammals.
Nest: Stick platform with shallow center, built near or over water.
Breeding: Season: March–August | Clutch: 2–6 pale bluish-green eggs | Incubation: 24–25 days | Nestling: 30–43 days.
Lifespan: At least 6 years.
How many are there? About 400,000 globally.
Conservation Status: Low concern.

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American Bittern

Identification: Medium-sized heron with compact body, short legs, and thick neck. Warm brown and buff with bold streaks.
Habitat: The American Bittern (Botaurus lentiginosus) inhabits shallow freshwater marshes with dense reeds and emergent vegetation.
Status and Movements: The American Bittern is an uncommon transient and rare breeder in Maryland. It is occasionally observed as a rare winter resident.
Behavior: When alarmed, points bill upward to blend with reeds.
Diet: The American Bittern feeds on insects, crustaceans, fish, frogs, lizards, and small mammals.
Nest: Platform of reeds lined with grasses in dense marsh vegetation.
Breeding: Season: April–August | Clutch: 2–7 beige to olive eggs | Incubation: 24–28 days | Nestling: 7–14 days, chicks remain nearby for weeks.
Lifespan: At least 8 years, 4 months.
How many are there? About 2.5 million globally.
Conservation Status: Low concern, though declining in some regions.

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Great Egret

Identification: Large white heron with long black legs, and yellow bill. Smaller than Great Blue Heron, larger than Snowy Egret. Breeding adults grow long back plumes.
Habitat: The Great Egret (Ardea alba) inhabits freshwater, brackish, and coastal wetlands.
Status and Movements: The Great Egret is a common summer resident and transient in Maryland, present from early spring through fall.
Behavior: Hunts by standing still in shallow water, striking quickly at prey.
Diet: Great Egrets feed on primarily fish; also amphibians, reptiles, birds, mammals, and invertebrates.
Nest: Large stick platform in trees or shrubs, usually in colonies.
Breeding: Season: March–July | Clutch: 1–6 pale greenish-blue eggs | Broods: 1–2 | Incubation: 23–27 days | Nestling: 21–25 days.
Lifespan: Up to 22 years, 10 months.
How many are there? About 9.5 million in North America.
Conservation Status: Low concern; populations increasing.

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Red-shouldered Hawk

Identification: Adult: Barred reddish-peach underparts, strongly banded tail, checkered wings, pale wing crescents near tips. Immature: Brown above, white below streaked with brown, pale wing crescents.
Habitat: The Red-shouldered Hawk (Buteo lineatus) inhabits tall woods near water, including swamps, riparian forests, and suburban parks.
Status and Movements: The Red-shouldered Hawk is a common resident and migrant throughout Maryland, observable year-round in wooded wetlands.
Behavior: Hunts from perches with swift descents. Soars and glides frequently. Males perform a “sky dance” display during courtship.
Diet: Feeds on small mammals, lizards, snakes, amphibians, voles, chipmunks, and birds.
Nest: Large stick nests (~2 ft diameter), placed in tree crotches near water. Often reused in subsequent years.
Breeding: Season: Late March-July | Clutch: 2–5 dull white to bluish, brown-blotched eggs | Broods: 1 | Incubation: 32–40 days | Nestling period: 42–49 days.
Lifespan: At least 25 years, 10 months.
How many are there? Global breeding population about 1.9 million.
Conservation Status: Low conservation concern.

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Caspian Tern

Identification: Largest tern species. White overall. Breeding adults have a black crown and a coral-red bill. In winter and juveniles, the crown is partially black with grayish speckling.
Habitat: Caspian Terns (Hydroprogne caspia) are found along ocean coasts, barrier islands, interior lakes and rivers.
Status and Movements: The Caspian Tern is an uncommon transient in Maryland, primarily seen during spring and fall migration along coastal areas.
Behavior: Caspian Terns fly slowly before plunging for fish. Roosts and rests in flocks.
Diet: Primarily fish; also crayfish, large insects, and occasionally scavenged invertebrates.
Nest: A shallow scrape in open areas lined with dried vegetation and ringed with pebbles, or other debris.
Breeding: Season: mid-May-late August | Clutch: 1-3 buff with dark spots eggs | Broods: 1 | Eggs: | Incubation: 25–28 days | Nestling: 1–2 days.
Lifespan: At least 32 years, 1 month.
How many are there? ~530,000 global breeders.
Conservation Status: Low Concern.

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Glossy Ibis

Identification: Deep maroon body with metallic green, bronze, and violet wing coverts. It appears black in the distance.
Habitat: The Glossy Ibis (Plegadis chihi) uses freshwater, brackish, and saltwater marshes and rice fields.
Status and Movements: The Glossy Ibis is an uncommon transient and local summer resident in Maryland, arriving in spring and departing by fall.
Behavior: Feeds and nests in flocks. Forages by probing wet substrates or gleaning.
Diet: Glossy Ibises feed on aquatic invertebrates, crabs, fish, amphibians, grain, crops.
Nest: Bulky platform of sticks/reeds, on ground or in trees up to 12 ft high, in colonies.
Breeding: Season: April-June | Clutch: 3–4 eggs | Broods: 1 | Incubation: 20–22 days | Nestling: 8–9 days.
Lifespan: At least 21 years.
How many are there? In North America: 13,000–15,000 individuals.
Conservation Status: Low concern.

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Pied-billed Grebe

Identification: Small, chunky brown waterbird. Adults have a dark crown and nape, and a whitish bill with a black band in breeding season (yellow-brown outside breeding). Juveniles show distinctive striped faces.
Habitat: The Pied-billed Grebe (Podilymbus podiceps) occupies ponds, marshes, lakes, sluggish rivers, and areas with emergent vegetation or open water.
Status and Movements: The Pied-billed Grebe is a common transient and winter resident in Maryland. A small number also breed locally during summer.
Behavior: Forages by diving to pursue prey. Typically solitary but may form small winter flocks.
Diet: Pied-billed Grebes feed on crayfish, shrimps, fish, frogs, tadpoles, and salamanders.
Nest: Floating open-bowl nest built anchored among emergent plants.
Breeding: Season: February-November | Clutch: 2–10 bluish white, unmarked eggs | Broods: 1–2 | Incubation: 23–27 days | Chicks: Leave the nest within 1 day.
Lifespan: At least 4 years, 7 months.
How many are there? Global breeding population about 3.1 million.
Conservation Status: Low conservation concern.

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Horned Grebe

Identification: Breeding: Dark gray back, cinnamon neck and sides, yellow head-tufts, black head. Nonbreeding: Grayish above, white below, black cap, white cheek. 
Habitat: The Horned Grebe (Podiceps auritus) favors freshwater ponds, lakes, rivers, bays, oceans, marshes, emergent vegetation. 
Status and Movements: The Horned Grebe is a common winter resident in Maryland, typically found on open water from late fall through early spring.
Behavior: Forages by surface diving. Highly territorial when nesting; forms small flocks during winter and migration. 
Diet: Horned grebes feed on fish, crustaceans, insects, larvae, salamanders, frogs, tadpoles, leeches, marine worms. 
Nest: Floating mass of aquatic vegetation anchored to plants or bottom near shoreline. 
Breeding: Season: Mid May-September | Clutch: 3-8 White, brownish, or bluish-green eggs | Broods: 1 | Incubation: 23-24 days | Nestling: <1 day. 
Lifespan: At least 5 years, 11 months. 
How many are there?: There are ~620,000 Horned Grebes globally. 
Conservation Status: Tipping Point Yellow Alert, due to significant long-term population declines.

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Ring-billed Gull

Identification: Breeding: White head, yellow bill with black ring, yellow legs, light gray mantle, black wingtips. Nonbreeding: Streaked brown on head and neck. Juvenile: Brown-mottled overall, pinkish legs, black-tipped pink bill; becomes gray-backed with distinct tail band by second winter.
Habitat: The Ring-billed Gull (Larus delawarensis) uses lakes, rivers, coasts, mudflats, docks, landfills, parking lots, fields.
Status and Movements: The Ring-billed Gull is a common winter resident and abundant transient in Maryland, present from late fall through spring.
Behavior: The Ring-billed Gull forages by scavenging or dipping. Highly social, nests in large colonies.
Diet: Fish, insects, earthworms, grain, rodents, refuse, carrion.
Nest: Scrape on ground lined with grass, twigs, or lichens. Breeds in large colonies.
Breeding: Breeding Months: late April – mid-August | Clutch: 2-4 olive gray with dark brown spots eggs | Broods: 1 | Incubation: 21-28 days | Nestling: ~5 days.
Lifespan: At least 27 years, 6 months.
How many are there?: There are ~2.5 million Ring-billed Gulls.
Conservation Status: Least Concern.

Small Wetland Birds of Maryland (< 1 lb)

This group includes the lightest wetland species in the state, ranging from just under one pound to only a few ounces. Despite their small size, they occupy a wide variety of wetland habitats and can vary noticeably in structure and proportions. Several members of this category are notably secretive, often detected by voice rather than sight as they move quietly through dense marsh vegetation.

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Snowy Egret

Identification: All-white heron with black bill, black legs, and yellow feet. Immatures have duller greenish legs. Breeding adults grow filmy curving plumes.
Habitat: The Snowy Egret (Egretta thula) forages in fresh, salt, and brackish water wetlands.
Status and Movements: The Snowy Egret is a common summer resident and transient in Maryland, arriving in spring and departing by early fall.
Behavior: Hunts in shallow water, spearing or chasing prey; uses yellow feet to stir or herd fish before striking.
Diet: Snowy Egrets feed on small fish, frogs, shrimp, and insects.
Nest: Shallow twig platform, usually over water.
Breeding: Season: March–July | Clutch: 2–6 pale greenish-blue eggs | Incubation: 24–25 days | Nestling: 20–24 days.
Lifespan: At least 17 years, 7 months.
How many are there? About 2.1 million globally.
Conservation Status: Low concern.

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King Rail

Identification: Large, chickenlike, rusty wings and breast, and a striped belly. Gray cheeks and whitish throat. Juveniles are darker with shorter bills.
Habitat: The King Rail (Rallus elegans) inhabits brackish and freshwater marshes, rice fields, and areas with tall emergent vegetation.
Status and Movements: The King Rail is an uncommon resident and local breeder in Maryland, found year-round in freshwater marshes, though secretive.
Behavior: Forages slowly, stalking prey in shallow water and jabbing with its bill.
Diet: King rails feed on crayfish, crabs, fish, frogs, snakes, fruits, acorns, seeds, and rice.
Nest: Simple round platform elevated above water, made of marsh grasses or rice plants.
Breeding: Season: February-August | Clutch: 10–12 pale buff with irregular brown spots eggs | Broods: 1–2 | Incubation: 21–23 days | Chicks: Leave nest within 1 day, become independent in ~2 months.
Lifespan: Not available.
How many are there? Global breeding population about 69,000 individuals.
Conservation Status: Listed as an Orange Alert species in 2025.

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Tricolored Heron

Identification: Slim, medium-sized heron with blue-gray and lavender upperparts, white belly, and dagger-like bill. Breeding adults show pale plumes; juveniles have rusty neck and feather edges.
Habitat: The Tricolored Heron (Egretta tricolor) forages salt, fresh, and brackish water wetlands, and ditches.
Status and Movements: The Tricolored Heron is an uncommon summer resident and transient in Maryland, present from late spring through early fall.
Behavior: Hunts by stalking, or chasing; often spins with sudden stops and wing flaps.
Diet: Mainly small fish; also other small vertebrates.
Nest: Tricolored Herons build a bulky stick platform in trees or shrubs; often in colonies.
Breeding: Season: May–July | Clutch: 3–5 pale greenish-blue eggs | Broods: 1 | Incubation: 21–24 days | Nestling: 17–21 days.
Lifespan: At least 17 years, 8 months.
How many are there? About 194,000 breeding in the U.S.
Conservation Status: Low concern.

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Eared Grebe

Identification: Breeding: Black with chestnut flanks, golden plumes behind red eyes. Nonbreeding: Grayish-black, smudgy cheeks, white neck. Immatures are similar to nonbreeding adults.
Habitat: The Eared (Black-necked) Grebe (Podiceps nigricollis) favors shallow lakes, ponds, wetlands, saline waters, salt ponds, ocean coastlines. 
Status and Movements: The Eared Grebe is an uncommon winter visitor and transient in Maryland, typically observed on larger bodies of water from late fall to spring.
Behavior: Forages by diving or surface pecking. Highly social, breeds in colonies and migrates in massive flocks. 
Diet: Eared Grebes feed on brine shrimp, brine flies, aquatic invertebrates, small fish, mollusks, amphibians. 
Nest: Floating platform of aquatic plants attached to emergent vegetation. Breeds in colonies. 
Breeding: Season: May-Aug | Clutch: 1-8 whitish eggs | Broods: 1 | Incubation: 20-23 days | Nestling: <1 day. 
Lifespan: At least 8 years, 7 months. 
How many are there?: There are ~2.7 million Eared Grebes globally. 
Conservation Status: Low Concern.

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Cattle Egret

Identification: Stocky heron with short, thick neck. Adults are white with buff plumes in breeding season; bill turns bright red before pairing. Juveniles lack plumes and have black bills.
Habitat: The Cattle Egret (Bubulcus ibis) uses wet grasslands, pastures, farmlands; favors drier open areas more than other herons.
Status and Movements: The Cattle Egret is a common summer resident and transient in Maryland, arriving in spring and departing by early fall.
Behavior: Walks with a distinctive head-pumping strut. It often follows cattle.
Diet: Cattle Egrets feed on mainly insects and other invertebrates.
Nest: Stick platform in trees, or marsh vegetation; nests colonially with other wading birds.
Breeding: Season: March–June | Clutch: 3–4 pale bluish-white eggs | Broods: 1 | Incubation: 23 days | Nestling: 30 days.
Lifespan: Up to 15 years.
How many are there? 3.8–6.7 million globally.
Conservation Status: Least Concern.

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Little Blue Heron

Identification: Adults are dark blue-gray with purple-maroon head and neck, greenish legs, and pale gray-and-black bill. Juveniles are all white; immatures are patchy white and blue.
Habitat: The Little Blue Heron (Egretta caerulea) forages in most types of wetlands and flooded fields.
Status and Movements: The Little Blue Heron is an uncommon summer resident and transient in Maryland, present from late spring through early fall.
Behavior: Stand-and-wait predator, also moves slowly searching for prey.
Diet: Small fish, frogs, shrimp, insects, and other invertebrates.
Nest: The Little Blue Heron builds a porous twig platform in shrubs or small trees over water; often in mixed colonies.
Breeding: Season: March–October | Clutch: 3–4 pale bluish-green eggs | Incubation: 22–23 days | Nestling: 35–49 days.
Lifespan: Up to 13 years, 11 months.
How many are there? About 1.1 million globally.
Conservation Status: Low concern, though populations have declined.

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American Avocet

Identification: Striking black-and-white body, long upturned bill, and bluish-gray legs. In summer, the head and neck are rusty; in winter, they turn grayish-white.
Habitat: The American Avocet (Recurvirostra americana) forages in shallow freshwater and saltwater wetlands, rice fields, and flooded pastures.
Status and Movements: The American Avocet is an uncommon transient in Maryland, primarily observed during spring and fall migration along coastal mudflats.
Behavior: Forages by sweeping its bill side to side, pecking, or plunging. Often associated with other shorebirds in flocks.
Diet: American Avocets feed on aquatic invertebrates, plus small fish and seeds.
Nest: A shallow ground scrape, sometimes unlined, located on islands or dikes, with little or no vegetation.
Breeding: Season: late April-early August | Clutch: 3–4 greenish brown with dark spots eggs | Broods: 1 | Incubation: 18–30 days | Nestling: able to walk within 24 hours.
Lifespan: At least 15 years.
How many are there? Global breeding population ~450,000.
Conservation Status: Low Concern.

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Common Gallinule

Identification: Charcoal gray with a distinct white side stripe. Adults feature a bright red forehead shield and red bill tipped in yellow. Immatures are similar but lack the red shield and bill coloration.
Habitat: The Common Gallinule (Gallinula galeata) inhabits freshwater and brackish wetlands. Also found in ditches, rice fields, sewage, and stormwater ponds.
Status and Movements: The Common Gallinule is a summer resident in Maryland, arriving in April and departing by October. Look for this marsh bird in freshwater wetlands, often year-round in milder coastal regions.
Behavior: Swims, walks on floating vegetation with a crouched posture, often flicking its tail. Highly territorial during breeding.
Diet: Aquatic vegetation and seeds, plus snails and insects.
Nest: A broad bowl, typically 10–12 inches wide, placed on thick aquatic plant mats.
Breeding: Season: April-August | Clutch: 3–15 light gray with darker specks/spots eggs | Broods: 1–2 | Incubation: 19–22 days | Chicks: leave the nest within 1 day.
Lifespan: At least 9 years, 10 months.
How many are there? Apparently declining.
Conservation Status: Low Concern.

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Clapper Rail

Identification: Chickenlike with a stout orange bill, stubby tail, and laterally compressed body. Barred sides and belly, pink legs. Chicks covered in black down.
Habitat: The Clapper Rail (Rallus crepitans) inhabits saltmarshes with dense vegetation, mangroves, and shallow saltwater habitats.
Status and Movements: The Clapper Rail is a common resident in Maryland’s coastal salt marshes. Its distinctive “clap-clap-clap” call is heard year-round, though numbers increase during the breeding season.
Behavior: Forages hidden among marsh vegetation. Territorial, sometimes in loose colonies.
Diet: Eats small crabs, shrimp, fish, and plant material.
Nest: Bulky platform of marsh plants, often tall and camouflaged, sometimes with domes or ramps.
Breeding: Season: April-October | Clutch: 2–16 creamy white to buff with irregular brown blotches eggs | Broods: 1–2 | Incubation: 18–24 days | Chicks: Leave the nest within 1 day.
Lifespan: At least 7 years, 6 months.
How many are there? Global population about 210,000 individuals.
Conservation Status: Low conservation concern.

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Purple Gallinule

Identification: Adult: Purplish body with green wings and back, yellow-tipped red bill, blue frontal shield. Juvenile: Brown upperparts, khaki underparts, duller bill.
Habitat: The Purple Gallinule (Porphyrio martinicus) favors freshwater marshes and wetlands with emergent or floating vegetation such as water lilies.
Status and Movements: The Purple Gallinule is an accidental visitor to Maryland, occasionally appearing in late spring or summer. Its vibrant plumage makes it an unmistakable, though rare, sight in freshwater marshes.
Behavior: Forages slowly over vegetation, pecking at food and flicking its tail. Juveniles often help feed younger siblings.
Diet: Omnivorous—feeds on aquatic plant seeds, invertebrates, small frogs, fish, and bird eggs.
Nest: Cup-shaped platform of rushes, floating or anchored to vegetation, sometimes partially roofed.
Breeding: Season: May-August | Clutch: 6–8 creamy white with small irregular brown spots eggs | Broods: 1 | Incubation: 20–23 days | Nestling: Leaves nest within 1 day.
Lifespan: At least 7 years, 4 months.
How many are there? Estimated 390,000 individuals.
Conservation Status: Low Concern.

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Bonaparte’s Gull

Identification: Breeding: Black hood, white eye-arcs, red legs, white outer-wing wedges. Nonbreeding: White head, prominent black ear spot, pinkish legs. Juvenile: Brown-scaled upperparts, black “M” pattern across wings, pinkish legs, dark tail band.
Habitat: The Bonaparte’s Gull (Chroicocephalus philadelphia) Boreal lakes, rivers, coastal bays, estuaries, mudflats, open ocean, sewage lagoons.
Status and Movements: The Bonaparte’s Gull is a common winter visitor and transient in Maryland, present from late fall through early spring. Look for this small, graceful gull on coastal waters and large inland lakes.
Behavior: The Bonaparte’s Gull forages by surface-picking or plunging. Highly social, often found in large flocks.
Diet: Insects, small fish, crustaceans, marine worms, snails.
Nest: Small platform of sticks and moss built in coniferous trees. Nests solitarily or in loose groups.
Breeding: Breeding Months: Late May-July | Clutch: 2-4 buffy-green with dark blotcher eggs | Broods: 1 | Incubation: 22-25 days | Nestling: ~6-7 days.
Lifespan: At least 18 years.
How many are there?: There are ~475,000 to 700,000 Bonaparte’s Gulls globally.
Conservation Status: Least Concern.

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Green Heron

Identification: Small heron with velvet-green back, rich chestnut body, and dark cap. Juveniles are browner with pale neck streaks and wing spots.
Habitat: The Green Heron (Butorides virescens) forages in most types of wetlands and ditches.
Status and Movements: The Green Heron is a common summer resident in Maryland, arriving in April and departing by October. This small, stocky heron is often found lurking in dense vegetation along freshwater edges.
Behavior: Hunts by standing still or walking slowly in shallow water; strikes quickly when prey approaches.
Diet: Green Herons feed on small fish, shrimp, frogs, and insects.
Nest: Simple stick platform, in trees or shrubs. It is a solitary breeder.
Breeding: Season: February–July | Clutch: 3–5 pale green to bluish eggs | Broods: 1–2 | Incubation: 19–21 days | Nestling: 16–17 days.
Lifespan: Up to 8 years, 11 months.
How many are there? About 1.2 million globally.
Conservation Status: Bird in steep decline (~51%).

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American Woodcock

Identification: Plump bird, very long straight bill, short tail. Cryptic plumage. Hatchlings covered in thick down.
Habitat: The American Woodcock (Scolopax minor) if founs in forests openings and clearings, young shrubby deciduous forests, old fields, wet meadows.
Status and Movements: The American Woodcock is a resident breeder in Maryland, with northern populations wintering here. Its distinctive “peent” call and aerial display are signs of spring, typically from February to May.
Behavior: Forages probing soil for earthworms. Often rocks body while walking. Generally solitary; sometimes small clusters (2–4).
Diet: Earthworms, invertebrates, snails, millipedes, spiders, flies, beetles, ants. Plant material: sedges, pigweed.
Nest: Shallow depression on ground. Made by the female in leaf and twig litter. Usually in young upland woods.
Breeding: Breeding Months: January through May | Clutch: 1-5 grayish orange with splotches of brown eggs | Incubation: 20–22 days | Nestling: ~30 days (Independence).
Lifespan: 11 years, 4 months.
How many are there? Global population ~3.5 million individuals.
Conservation Status: Low Concern.

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Black-necked Stilt

Identification: Elegant black-and-white with long rose-pink legs, slender black bill, and a white patch around the eye. Females and juveniles show browner-black plumage in dark areas.
Habitat: The Black-necked Stilt (Himantopus mexicanus) is found in shallow wetlands, mudflats, sewage or evaporation ponds, and mangrove swamps.
Status and Movements: The Black-necked Stilt is an increasingly common summer resident in Maryland, arriving in April and departing by September. Its striking black-and-white plumage and long pink legs are unmistakable.
Behavior: Forages by wading and pecking, sometimes swinging the bill through water. Loud alarm calls and group displays help deter predators.
Diet: Black-necked Stilts eat primarily aquatic invertebrates; also take small amounts of seeds and plant material.
Nest: Shallow ground scrape on islands, in vegetation, or on floating mats.
Breeding: Season: April-August | Clutch: 2–5 tawny olive, dark brown speckling eggs | Broods: 1 | Incubation: 24–29 days | Nestling: Able to run within ~2 hours.
Lifespan: At least 12 years, 5 months.
How many are there? Estimated global, 900,000 individuals.
Conservation Status: Low Concern.

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Boat-tailed Grackle

Identification: Males are glossy black with a long, V-shaped tail. Females are dark brown above and russet below. Juveniles look like females.
Habitat: The Boat-tailed Grackle (Quiscalus major) is found in coastal saltwater and freshwater marshes. It is also found in urban areas and cultivated fields.
Status and Movements: The Boat-tailed Grackle is a common resident in Maryland, particularly in coastal and brackish marsh environments. Its large size and distinctive keel-shaped tail are visible year-round.
Behavior: Probes soil and water, dunks food before eating. Highly gregarious. Males employ a harem mating system.
Diet: Omnivorous scavenger; Boat-tailed Grackles feed on invertebrates, frogs, lizards, grains, seeds, and human food scraps.
Nest: A woven cup built in cattails or marsh grasses. Constructed as a woven cup with mud and lined with fine materials. Often breeds in colonies.
Breeding: Season: March-July | Clutch: 1–5 light blue with brown scrawls eggs | Broods: 1–2 | Incubation: ~13 days | Nestling: ~13 days.
Lifespan: At least 13 years, 1 month.
How many are there? Global breeding 2 million.
Conservation Status: Low Concern.

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Belted Kingfisher

Identification: Stocky, large-headed bird with shaggy crest, thick bill. Blue-gray above, white below with blue breast band. Females have rusty belly bands. Juveniles show rusty spotting.
Habitat: The Belted Kingfisher (Megaceryle alcyon) forages at streams, rivers, ponds, lakes, estuaries, and human-made pits.
Status and Movements: The Belted Kingfisher is a common resident in Maryland, found year-round along waterways. Its shaggy crest and rattling call are unmistakable as it dives for fish.
Behavior: Forages alone from a perch or by hovering, diving for prey. Territorial and solitary. Loud rattling calls.
Diet: Fish, crayfish, insects, amphibians, young birds, small mammals, berries.
Nest: Burrow in earthen bank near water, 3–6 ft deep, sloping upward to unlined chamber.
Breeding: Season: Mid-March-Late July | Clutch: 5–8 pure white eggs | Broods: 1–2 | Incubation: 22–24 days | Nestling: 27–29 days.
Lifespan: Typically 6 to 10 years.
How many are there? Global breeding population ~1.8 million.
Conservation Status: Low Concern.

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Forster’s Tern

Identification: Breeding adults are gray above, white below, with a black cap and an orange bill tipped in black. Nonbreeding adults have a thick black eye patch and a pale head. Juveniles resemble nonbreeding birds but have tan upperparts, a pale bill base, and shorter tails.
Habitat: The Forster’s Tern (Sterna forsteri) uses freshwater, brackish, and saltwater wetlands and bodies of water.
Status and Movements: The Forster’s Tern is a common summer resident and transient in Maryland, present from April to October. Look for this elegant tern in coastal bays and estuaries, often fishing gracefully.
Behavior: Forages mainly by plunge-diving for fish; sometimes hunts from perches. Highly social, often in flocks.
Diet: Forster’s Terns feed on small fish and insects.
Nest: A shallow scrape or rough bowl on the ground in marsh vegetation, floating mats, or atop muskrat lodges.
Breeding: Season: May-mid August | Clutch: 1–4 olive with dark spots eggs | Broods: 1 | Incubation: 23–28 days | Nestling period: 2–7 days.
Lifespan: At least 15 years, 10 months.
How many are there? ~98,000 global breeders.
Conservation Status: Low Concern.

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Wilson’s Snipe

Identification: Pudgy bird, very long straight bill. Intricately patterned. Hatchlings tan/chestnut down, black blotches, white crown streak.
Habitat: The Wilson’s Snipe (Gallinago delicata) forages in marshes, bogs, fens, wet meadows, rivers, ponds, wet pastures, muddy pond edges, and damp fields.
Status and Movements: The Wilson’s Snipe is a common winter resident and transient in Maryland, present from October to April. This secretive shorebird favors wet meadows and marshes, often flushing unexpectedly.
Behavior: Probes wet soil methodically. Swallows prey without removing bill. Elusive. Performs winnowing courtship display.
Diet: Wilson’s snipes feed on aquatic invertebrates, insect larvae, worms, snails, crustaceans. Occasionally lizards, frogs, and fish.
Nest: Shallow scrape in moist soil. Lined with coarse and finer grasses. Hidden on ground near water.
Breeding: Breeding Months: Mid-March-late August | Clutch: 2-4 olive brown splotched dark brown eggs | Incubation: 18-20 days | Nestling: Chicks leave the nest day of hatching.
Lifespan: At least 9 years, 3 months.
How many are there? Global population ~2 million individuals.
Conservation Status: Low Concern.

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Killdeer

Identification: Brownish-tan above, white below, with two distinct black breast bands and a black-and-white patterned face. Chicks with a single black breast band.
Habitat: The Killdeer (Charadrius vociferus) forage on lawns, pastures, golf courses, athletic fields, parking lots.
Status and Movements: The Killdeer is a common resident throughout Maryland, found year-round in open fields and disturbed areas. Its distinctive “kill-deer” call and broken-wing display are easily recognized.
Behavior: Forages by running and stopping to search the ground for food. Famous for the “broken-wing” distraction display to protect nests.
Diet: Killdeer feed on earthworms, grasshoppers, beetles, aquatic insect larvae, seeds, and frogs.
Nest: A shallow ground scrape, often decorated with rocks, shells, sticks, or debris.
Breeding: Season: March-October | Clutch: 4–6 buff with heavy blackish markings eggs | Broods: 1–3 | Incubation: 22–28 days | Nestlings: leave nest as soon as down is dry.
Lifespan: At least 10 years, 11 months.
How many are there? ~2.3 million global breeders.
Conservation Status: Low Concern.

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Least Bittern

Identification: Tiny heron; males are blackish above and buffy-brown below, females and juveniles are more uniformly brown. Juveniles appear scaly.
Habitat: The Least Bittern (Ixobrychus exilis) forages in freshwater and brackish marshes with tall cattails or reeds.
Status and Movements: The Least Bittern is a secretive summer resident in Maryland, arriving in May and departing by September. This tiny heron hides deep within dense marsh vegetation, making it difficult to spot.
Behavior: Hunts by standing still perched on standing reeds. When disturbed, compresses the body, raises neck and bill, and sways with reeds for camouflage.
Diet: The Least Bittern feeds on small fish, frogs, shrimp, mice and, dragonflies.
Nest: Well-hidden platform of reeds and sticks, about 6-30 inches above water.
Breeding: Season: April–July | Clutch: 2–6 pale blue or green eggs | Broods: 1–2 | Incubation: 17–20 days | Nestling: 6–15 days.
How many are there? About 310,000 globally.
Conservation Status: Low concern.

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Virginia Rail

Identification: Small, chickenlike with bill and short, upturned tail. Rusty overall with a gray face and black-and-white barred sides. Legs and bill are reddish.
Habitat: The Virginia Rail (Rallus limicola) inhabits shallow freshwater wetlands as well as muddy bottoms, saltmarshes, and brackish wetlands.
Status and Movements: The Virginia Rail is a resident in Maryland’s freshwater marshes, though northern populations migrate south. Its “kid-ick” call is a common sound in spring, often heard before the bird is seen.
Behavior: Forages by probing mud for prey. Usually solitary. Notable for jerky movements and frequent tail flicking.
Diet: Virginia Rails feeds on insects, small fish, frogs, and plant material including seeds in winter.
Nest: Woven basket of wetland vegetation, placed on floating mats at or just above the water surface.
Breeding: Clutch: 4–13 white/buff with sparse irregular brown spots eggs | Broods: 1–2 | Incubation: 18–20 days | Young: Leave nest after 3–4 days.
Lifespan: Not available.
How many are there? Trends appear stable, though difficult to estimate due to secretive behavior.
Conservation Status: Low conservation concern.

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Sora

Identification: Small, chubby rail with mottled gray and brown plumage. Distinctive yellow bill, black mask and throat patch. Females are duller with less black on the face and throat; juveniles lack the mask. Short tail is often cocked upward.
Habitat: The Sora (Porzana carolina) inhabits freshwater and brackish wetlands, wet pastures, ditches, and flooded fields during migration and winter.
Status and Movements: The Sora is a common summer resident and transient in Maryland, present from April to October. This small rail is often heard giving its “sora-sora” call from dense marsh vegetation.
Diet: Soras feed on seeds and aquatic invertebrates.
Nest: Shallow basket of cattails or sedges, built on mounds or attached to stems above shallow water.
Breeding: Season: May-August | Clutch: 6–10 cream to cinnamon with irregular brown spots eggs | Broods: 1–2 | Incubation: 17–20 days | Chicks: Leave the nest within 1 day.
Lifespan: Not available.
How many are there? Stable; Considered abundant.
Conservation Status: Low conservation concern.

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Black Tern

Identification: Breeding: Jet-black head and underparts, gray wings and tail, white undertail coverts. Nonbreeding: White face and underparts, dark crown and ear patch, dark smudge on breast sides. Juvenile: Similar to nonbreeding adult but with brown scaling on back and wings.
Habitat: The Black Tern (Chlidonias niger) uses freshwater marshes, lake edges, wet prairies, coastal lagoons, open ocean.
Status and Movements: The Black Tern is a transient visitor in Maryland, primarily seen during spring and late summer migration. Unlike other terns, it feeds by dipping to the water’s surface, often over inland waters.
Behavior: The Black Tern forages by hovering and dipping. Social, breeds in loose colonies, migrates in flocks.
Diet: Insects, small fish, spiders, crustaceans, tadpoles.
Nest: Fragile, floating cup of vegetation in shallow water. Breeds in loose colonies.
Breeding: Breeding Months: Mid-May-August | Clutch: 2-4 olive, dark-spotted eggs | Broods: 1 | Incubation: 17-22 days | Nestling: 18-24 days.
Lifespan: At least 11 years, 3 months.
How many are there?: There are ~850,000 Black Terns globally.
Conservation Status: Least Concern.

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Red-winged Blackbird

Identification: Adult males are glossy black with bright scarlet-and-yellow shoulder patches. Females are streaky dark brown with a paler breast and a whitish eyebrow.
Habitat: The Red-winged Blackbird (Agelaius phoeniceus) favors freshwater or saltwater marshes and the like, agricultural fields, feedlots, wet roadsides, and even golf courses.
Status and Movements: The Red-winged Blackbird is an abundant resident throughout Maryland, present year-round. Males display striking red and yellow epaulets, a common sight and sound in marshes and open fields.
Behavior: Males sing from high perches and aggressively defend territories. Highly social, with winter roosts often numbering in the millions, mixed with other blackbirds.
Diet: Red-winged Blackbirds feed on insects in summer; seeds and grains in winter.
Nest: Females build a cup-shaped nest in marsh vegetation, shrubs, trees, or crops.
Breeding: Season: April-early August | Clutch: 2–4 pale blue-green to gray with dark markings eggs | Broods: 1–2 | Incubation: 11–13 days | Nestling: 11–14 days.
Lifespan: At least 15 years, 9 months.
How many are there? ~180 million globally.
Conservation Status: Low concern.

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Yellow Rail

Identification: Small, brownish-yellow plumage. Paler yellowish face and breast with a dark cheek smudge. Juveniles are duller with fine barring on the nape, sides, and breast.
Habitat: The Yellow Rail (Coturnicops noveboracensis) inhabits shallow freshwater sedge marshes, wet meadows, saltgrass marshes, agricultural fields, and grassy cover.
Status and Movements: The Yellow Rail is a rare transient and winter visitor in Maryland, primarily observed in fall. This tiny, secretive rail inhabits dense, wet grasslands, making it extremely difficult to find.
Behavior: Walks quietly picking invertebrates and seeds. Rarely flies. Runs quickly through grass like a rodent.
Diet: Feeds on aquatic invertebrates, crustaceans, and seeds.
Nest: Yellow Rails nest on the ground. Build a small cup (~3.4 in across) covered with a canopy.
Breeding: Season: mid-May-early September | Clutch: 4–10 creamy buff with brown speckling eggs | Chicks: leave the nest within 1 day.
Lifespan: Not available.
How many are there? Global population over 12,000 individuals.
Conservation Status: Species of concern with more than 50% decline in the past 50 years.

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Black Rail

Identification: Tiny bird with gray-black plumage speckled white, black crown, chestnut nape, and red eyes. Immatures have less white and amber to hazel eyes.
Habitat: The Black Rail (Laterallus jamaicensis) occupies shallow wetlands, riparian zones, coastal prairies, saltmarshes, and rice fields.
Status and Movements: The Black Rail is an endangered, rare summer resident in Maryland, arriving in May and departing by September. This tiny, secretive marsh bird is extremely difficult to observe, favoring high marsh.
Behavior: Forages by gleaning invertebrates. Males defend territories and sing.
Diet: Black Rails feed on small invertebrates, as well as seeds from bulrush and cattail.
Nest: Circular bowl of fine grasses placed on the ground at the base of tall vegetation, often with a ramp of dead plant material.
Breeding: Season: March-early September | Clutch: 4–13 creamy white with fine brown spots eggs | Broods: 1–2 | Incubation: 17–20 days | Chicks: Leave the nest within 1 day.
Lifespan: Estimated at 5–9 years.
How many are there? Eastern subspecies numbers only 355–815 breeding pairs.
Conservation Status: The eastern subspecies is listed as Threatened under the U.S. Endangered Species Act.

Foraging Strategy and Habitat use as tools to Identify Maryland Wetland Birds

Even though many birds share wetlands, they don’t all feed in the same way. Each species uses specific strategies—diving, wading, probing mud, or hunting from the air—based on its food preferences and adaptations. For birdwatchers, knowing these foraging groups helps predict where certain species are most likely to be found in a wetland, making it easier to spot and identify them.

The table below summarizes the main foraging groups of Maryland’s wetland birds, their preferred habitats, and representative species.

Foraging Group	General Description of Strategy	Preferred Habitat Type	Representative Species
Diving Birds	Forage by diving beneath the water’s surface to find food.	Open, deep water (lakes, rivers, coastal areas)	Grebes, cormorants, anhingas
Open Water Waders	Forage by wading in shallow water with low-density vegetation.	Shallow water with low vegetation	Herons, egrets, ibises, storks, cranes, spoonbills, avocets, stilts
Dense Vegetation Waders	Forage by wading in shallow water surrounded by dense vegetation.	Shallow water with dense vegetation	Night herons, green herons, bitterns, rails, limpkin
Dipping/Dabbling Foragers	Forage by surface dipping or “tipping” in shallow water.	Shallow water, ponds, marshes with dense vegetation	Coots, gallinules
Moist-soil Foragers	Forage in muddy or moist-soil areas along the shoreline.	Muddy areas, moist soil, shorelines	Ibises, killdeer, rails, gallinules
Aerial Piscivores/snail eaters	Use perches or flight to spot and dive for prey.	Open water, often near perches or trees	Terns, kingfishers, eagles, osprey

Maryland Wetland Bird Hotspots: Top 5 Locations for Viewing

Maryland’s diverse aquatic habitats support substantial concentrations of herons, rails, coots, grebes, and others. The state’s unique position along the Atlantic Flyway makes its mix of tidal salt marshes and inland freshwater swamps a premier destination for witnessing spectacular seasonal migrations and resident waterbird displays.

Blackwater National Wildlife Refuge: Located on the Eastern Shore near Cambridge, this “Everglades of the North” features one-third of Maryland’s tidal wetlands. Its vast brackish marshes and managed impoundments provide sanctuary for massive numbers of Tundra Swans, American Bitterns, and Glossy Ibises, alongside a renowned Bald Eagle population.

Deal Island Wildlife Management Area: Situated in Somerset County, this site is dominated by over 9,000 acres of expansive tidal salt marshes and impoundments. It is an exceptional location for spotting secretive marsh birds like the Black Rail, Clapper Rail, and Seaside Sparrow foraging in the cordgrass.

Jug Bay Wetlands Sanctuary: Found along the Patuxent River in Anne Arundel County, this sanctuary encompasses one of the largest freshwater tidal marshes on the East Coast. Birders frequent the boardwalks to observe Sora, Least Bitterns, and Wood Ducks navigating the dense wild rice and pickerelweed beds.

Eastern Neck National Wildlife Refuge: Positioned at the mouth of the Chester River in Kent County, this island refuge offers a diverse mosaic of brackish marshes and open water. It is a critical wintering spot for thousands of Tundra Swans, Canvasbacks, and various other diving ducks.

Hart-Miller Island State Park: Located in the Chesapeake Bay near the mouth of Middle River, this man-made island features extensive dredged material containment facilities that mimic mudflats. It is a magnet for high concentrations of American Avocets, Black-necked Stilts, and various rare species of migrating shorebirds.

Photo Credits:

The photographic material used in this guide was made available on various websites. Many thanks to Andrew Morffew, Mark Mochell, Elizabeth Milson, Duzan Brinkhuizen, Dennis Church, Wendy Miller, Rick From Alabama, John Benson, Mick Thompson, Steve Guttman, Victor Espinoza, Kelly Colgan-Azar, Andy Reago, Chrissy McLaren, Garry C., Linda Fortuna, Vicky DeLoach, Paul Hurtado, Tom Murray, Tom Wilberding, Kenneth Cole-Schneider, Doug Greenberg, Brian Garrett, David White, Becky Matsubara, Dan Mooney, Hal Trachtenberg, Lloyd Davis, Denis Fournier, Gregory Heaton, hharryus, Greg Lavaty, Dona Hilkey, Joshua Mayer, Aaron Maizlish, Ashley Tubs, Richard George, Sandra Minica, Nick, Jon valentine, Steve Valasek, Mitch Walters, Kurayba and Julio Mulero.

Voices:

Most recordings were made by Paul Marvin.

References and Sources:

• Allaboutbirds.org
• eBird. (https://ebird.org/)
• Birds of the World: https://birdsoftheworld.org/bow/home
• Gill, Frank B., 1994. Ornithology – 2nd Edition, W. H. Freeman and Company.
• Sibley, David, 2000, The Sibley Guide to Birds. Alfred A. Knopf, Publisher.
• Species Longevity Data: United States Geological Survey (https://www.usgs.gov/)
• The Sibley Guide to Bird Life and Behavior, 2001. Chris Elphick, John Dunning, and David Sibley (eds). Alfred A. Knopf, New York.

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