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IUCN	Name	Scientific Name	Size	Id	R
LC	Black Skimmer (3)	Rynchops niger	43 - 46		R
LC	Little Gull	Hydrocoloeus minutus	24 - 30		R
LC	Ross's Gull	Rhodostethia rosea	29 - 36		R
LC	Sabine's Gull (4)	Xema sabini	27 - 36		R
NT	Ivory Gull	Pagophila eburnea	40 - 47		R
VU	Red-legged Kittiwake	Rissa brevirostris	39 - 43		R
VU	Black-legged Kittiwake (2)	Rissa tridactyla	37 - 43		R
LC	Bonaparte's Gull	Larus philadelphia	28 - 36		R
LC	Black-headed Gull	Larus ridibundus	37 - 43		R
LC	Franklin's Gull	Larus pipixcan	32 - 38		R
LC	Laughing Gull (2)	Larus atricilla	36 - 42		R
NT	Heermann's Gull	Larus heermanni	48		R
LC	Black-tailed Gull	Larus crassirostris	45 - 48		R
LC	Ring-billed Gull	Larus delawarensis	45 - 53		R
LC	Mew Gull (4)	Larus canus	40 - 50		R
LC	Short-billed Gull	Larus brachyrhynchus	40 - 46		R
LC	Western Gull (2)	Larus occidentalis	64		R
LC	California Gull (2)	Larus californicus	51 - 58		R
LC	Lesser Black-backed Gull (5)	Larus fuscus	52 - 67		R
LC	Herring Gull (5)	Larus argentatus	55 - 67		R
LC	Yellow-legged Gull (5)	Larus cachinnans	55 - 67		R
LC	Iceland Gull (3)	Larus glaucoides	52 - 60		R
LC	Slaty-backed Gull	Larus schistisagus	55 - 67		R
LC	Glaucous-winged Gull	Larus glaucescens	61 - 68		R
LC	Glaucous Gull (4)	Larus hyperboreus	56 - 77		R
LC	Great Black-backed Gull	Larus marinus	59 - 78		R
VU	Aleutian Tern	Onychoprion aleuticus	32 - 34		R
LC	Sooty Tern (8)	Onychoprion fuscatus	36 - 46		R
LC	Bridled Tern (6)	Onychoprion anaethetus	35 - 42		R
LC	Least Tern (3)	Sternula antillarum	20 - 28		R
LC	Gull-billed Tern (8)	Gelochelidon nilotica	33 - 43		R
LC	Caspian Tern	Hydroprogne caspia	48 - 58		R
LC	White-winged Tern	Chlidonias leucopterus	22 - 27		R
LC	Black Tern (2)	Chlidonias niger	22 - 28		R
LC	Roseate Tern (5)	Sterna dougallii	33 - 38		R
LC	Common Tern (4)	Sterna hirundo	32 - 38		R
LC	Arctic Tern	Sterna paradisaea	32 - 39		R
LC	Forster's Tern	Sterna forsteri	32 - 36		R
NT	Elegant Tern	Thalasseus elegans	37 - 41		R
LC	Sandwich Tern (3)	Thalasseus sandvicensis	34 - 46		R
LC	Royal Tern (2)	Thalasseus maximus	43 - 48		R

Taxonomy: HBW - BirdLife (v3)

Genera: 14 (Family: 20) Species: 41 (Family: 110)