Gulls and Terns:

Black Tern
Chlidonias niger

Herring Gull
Larus argentatus

Laughing Gull
Larus atricilla

California Gull
Larus californicus

Mew Gull
Larus canus

Ring-billed Gull
Larus delawarensis

Glaucous-winged Gull
Larus glaucescens

Heermann's Gull
Larus heermanni

Glaucous Gull
Larus hyperboreus

Great Black-backed Gull
Larus marinus

Western Gull
Larus occidentalis

Bonaparte's Gull
Larus philadelphia

Franklin's Gull
Larus pipixcan

Red-legged Kittiwake
Rissa brevirostris

Black-legged Kittiwake
Rissa tridactyla

Black Skimmer
Rynchops niger

Long-tailed Jaeger
Stercorarius longicaudus

Parasitic Jaeger
Stercorarius parasiticus

Aleutian Tern
Sterna aleutica

Least Tern
Sterna antillarum

Caspian Tern
Sterna caspia

Elegant Tern
Sterna elegans

Forster's Tern
Sterna forsteri

Common Tern
Sterna hirundo

Royal Tern
Sterna maxima

Gull-billed Tern
Sterna nilotica

Arctic Tern
Sterna paradisaea

Sandwich Tern
Sterna sandvicensis

Brown Noddy
Anous stolidus

Lesser Black-backed Gull
Larus fuscus

Iceland Gull
Larus glaucoides

Common Black-headed Gull
Larus ridibundus

Thayer's Gull
Larus thayeri

Ivory Gull
Pagophila eburnea

Ross's Gull
Rhodostethia rosea

South Polar Skua
Stercorarius maccormicki (Catharacta maccormicki)

Pomarine Jaeger
Stercorarius pomarinus

Great Skua
Stercorarius skua (Catharacta skua)

Bridled Tern
Sterna anaethetus

California Least Tern
Sterna antillarum browni

Sooty Tern
Sterna fuscata

Sabine's Gull
Xema sabini