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Dams

11 Bird Species

Black-legged Kittiwake

This smallish gull is short-legged and short-billed. At rest, the tail is slightly notched. Alternate Adult: Medium gray mantle, with all-white head, tail, and underparts. The legs are short and black. Bill is all yellow. At close range, note the red eye ring and gape. Basic Adult: Blackish spot on a more...

Length: 38 cm Wingspan: 93 cm

Bonaparte's Gull

This small gull is recognized in all plumages by the thin all-black bill, and in flight by the white wedge on the leading edge of the upper surface of the outer wing, and the black trailing edge of the primaries. The underside of the wing is very pale gray, fading to white on the primaries. The upper more...

Length: 30 cm Wingspan: 80 cm

California Gull

A medium-sized, long-winged four-year gull of Western North America. There are two subspecies, the more northerly and interior breeding "albertaensis," which is larger and tends to be paler above as an adult and the more southerly and coastal breeding "californicus," which averages smaller and darker more...

Length: 53 cm Wingspan: 137 cm

Great Black-backed Gull

A very large, bulky, blocky-headed, four-year gull of the Atlantic. Alternate Adult has dark slate-gray (near black) mantle that is darker than any other regular North American gull, black wingtips with small white spots, white head and underparts, usually pale eye, pink legs, and yellow bill with re more...

Length: 76 cm Wingspan: 165 cm

Herring Gull

A large, pink-legged, four-year gull. Alternate Adult has pale pearly gray mantle, black wingtips, white underparts and head, pale yellow eye, pink legs, and a yellow bill with red spot at the tip. Shows similar amount of black on both upper and undersides of wingtips. Basic Adult has dark brown stre more...

Length: 64 cm Wingspan: 147 cm

Iceland Gull

The wing tip pattern on this species is extremely variable, with some individuals approaching Thayer's Gull. Some consider the two to be the same species. Two subspecies of Iceland Gull are currently recognized, Iceland Gull and Kumlien's Gull, the latter of which is most likely to be found in the U. more...

Length: 51 cm Wingspan: 130 cm

Lesser Black-backed Gull

This European species is becoming increasingly common in North America in winter. In all plumages, note the rounded head, slender bill, and very long wings extending well beyond the tail. Alternate Adult: The mantle is slate gray, usually lighter than Great Black-backed Gull, though some birds from W more...

Length: 50 cm Wingspan: 137 cm

Little Gull

The smallest gull, this species is a rare breeder in North America. In all plumages, note the small, slender black bill, short legs, and slightly rounded wings. Alternate Adult: Note the extensive black hood with no eye crescents. Upperparts are pale gray, underparts white. In flight, the entire uppe more...

Length: 28 cm Wingspan: 69 cm

Ring-billed Gull

A mid-sized, three-year gull. Alternate Adult has yellow bill with black ring at the tip, yellow legs, pale eye, very pale gray back, black wingtips, white tail, and white head and underparts. Basic Adult has limited brown streaking on nape. Second-cycle birds have black-tipped tail and smudgier ring more...

Length: 44 cm Wingspan: 122 cm

Ross's Gull

A delicate, rare, two-year gull. Alternate Adult has fine black collar around upper neck, pale gray upperparts, white underparts with slight pink wash, red legs, and tiny black bill. In flight, note darker gray underwings and wedge-shaped tail. Basic Adult has small black spot behind eye and lacks ro more...

Length: 34 cm Wingspan: 84 cm

Thayer's Gull

This large gull is very similar to Iceland Gull, and some have suggested that the two are actually one species. Thayer’s Gulls have a rounded head and fairly small bill, giving this bird a “gentle” expression compared to other large gulls. At rest, the primaries extend well beyond the end of th more...

Length: 58 cm Wingspan: 140 cm

Non-vegetated Areas

0 species

Salt Water

11 species

Black-legged Kittiwake

Rissa tridactyla

Open Ocean, Inshore Waters, Coastal Cliffs, Dams, Lakes Resevoirs

Bonaparte's Gull

Chroicocephalus philadelphia

Estuaries and Bays, Inshore Waters, Saltmarshes, Sewage Treatment Plants, Dams, Fresh Water Marshes, Lakes Resevoirs, Ponds and Rivers, Boreal Forest

California Gull

Larus californicus

Open Ocean, Estuaries and Bays, Inshore Waters, Beaches, Urban Landscapes, Suburban/residential Landscapes, Sewage Treatment Plants, Dams, Fresh Water Marshes, Lakes Resevoirs, Ponds and Rivers

Great Black-backed Gull

Larus marinus

Open Ocean, Estuaries and Bays, Inshore Waters, Rocky Shores, Beaches, Coastal Dunes, Saltmarshes, Urban Landscapes, Suburban/residential Landscapes, Dams, Lakes Resevoirs

Herring Gull

Larus argentatus

Open Ocean, Estuaries and Bays, Inshore Waters, Rocky Shores, Coastal Cliffs, Beaches, Urban Landscapes, Suburban/residential Landscapes, Sewage Treatment Plants, Dams, Lakes Resevoirs

Iceland Gull

Larus glaucoides

Open Ocean, Estuaries and Bays, Inshore Waters, Rocky Shores, Coastal Cliffs, Beaches, Sewage Treatment Plants, Dams, Lakes Resevoirs

Lesser Black-backed Gull

Larus fuscus

Estuaries and Bays, Inshore Waters, Beaches, Urban Landscapes, Sewage Treatment Plants, Dams, Lakes Resevoirs

Little Gull

Hydrocoloeus minutus

Open Ocean, Inshore Waters, Sewage Treatment Plants, Dams, Fresh Water Marshes, Lakes Resevoirs

Ring-billed Gull

Larus delawarensis

Estuaries and Bays, Inshore Waters, Beaches, Tidal Mudflats and Shallows, Saltmarshes, Urban Landscapes, Suburban/residential Landscapes, Sewage Treatment Plants, Dams, Fresh Water Marshes, Lakes Resevoirs

Ross's Gull

Rhodostethia rosea

Estuaries and Bays, Inshore Waters, Sewage Treatment Plants, Dams, Lakes Resevoirs

Thayer's Gull

Larus thayeri

Open Ocean, Inshore Waters, Beaches, Urban Landscapes, Sewage Treatment Plants, Dams, Lakes Resevoirs

Human-altered Areas

11 species

Black-legged Kittiwake

Rissa tridactyla

Open Ocean, Inshore Waters, Coastal Cliffs, Dams, Lakes Resevoirs

Bonaparte's Gull

Chroicocephalus philadelphia

Estuaries and Bays, Inshore Waters, Saltmarshes, Sewage Treatment Plants, Dams, Fresh Water Marshes, Lakes Resevoirs, Ponds and Rivers, Boreal Forest

California Gull

Larus californicus

Open Ocean, Estuaries and Bays, Inshore Waters, Beaches, Urban Landscapes, Suburban/residential Landscapes, Sewage Treatment Plants, Dams, Fresh Water Marshes, Lakes Resevoirs, Ponds and Rivers

Great Black-backed Gull

Larus marinus

Open Ocean, Estuaries and Bays, Inshore Waters, Rocky Shores, Beaches, Coastal Dunes, Saltmarshes, Urban Landscapes, Suburban/residential Landscapes, Dams, Lakes Resevoirs

Herring Gull

Larus argentatus

Open Ocean, Estuaries and Bays, Inshore Waters, Rocky Shores, Coastal Cliffs, Beaches, Urban Landscapes, Suburban/residential Landscapes, Sewage Treatment Plants, Dams, Lakes Resevoirs

Iceland Gull

Larus glaucoides

Open Ocean, Estuaries and Bays, Inshore Waters, Rocky Shores, Coastal Cliffs, Beaches, Sewage Treatment Plants, Dams, Lakes Resevoirs

Lesser Black-backed Gull

Larus fuscus

Estuaries and Bays, Inshore Waters, Beaches, Urban Landscapes, Sewage Treatment Plants, Dams, Lakes Resevoirs

Little Gull

Hydrocoloeus minutus

Open Ocean, Inshore Waters, Sewage Treatment Plants, Dams, Fresh Water Marshes, Lakes Resevoirs

Ring-billed Gull

Larus delawarensis

Ross's Gull

Rhodostethia rosea

Estuaries and Bays, Inshore Waters, Sewage Treatment Plants, Dams, Lakes Resevoirs

Thayer's Gull

Larus thayeri

Open Ocean, Inshore Waters, Beaches, Urban Landscapes, Sewage Treatment Plants, Dams, Lakes Resevoirs

Fresh Water

11 species

Grassland and Scrubland

0 species

Forest and Woodlands

1 species

Bonaparte's Gull

Chroicocephalus philadelphia

Estuaries and Bays, Inshore Waters, Saltmarshes, Sewage Treatment Plants, Dams, Fresh Water Marshes, Lakes Resevoirs, Ponds and Rivers, Boreal Forest