Forster's Tern

36-42 cm

african-skimmer

Rynchops flavirostris

30-34 cm

aleutian-tern

Onychoprion aleuticus

43-46 cm

andean-gull

Larus serranus

31-38 cm

antarctic-tern

Sterna vittata

54-66 cm

arctic-herring-gull

Larus smithsonianus

33-39 cm

arctic-tern

Sterna paradisaea

52-62 cm

armenian-gull

Larus armenicus

30-33 cm

atlantic-white-tern

Gygis alba

48-52 cm

audouin%27s-gull

Larus audouinii

35-40 cm

australian-gull-billed-tern

Gelochelidon macrotarsa

49-53 cm

belcher%27s-gull

Larus belcheri

35-39 cm

black-headed-gull

Larus ridibundus

34-39 cm

black-noddy

Anous minutus

40-50 cm

black-skimmer

Rynchops niger

23-28 cm

black-tern

Chlidonias niger

32-34 cm

black-bellied-tern

Sterna acuticauda

35-38 cm

black-billed-gull

Larus bulleri

27-29 cm

black-fronted-tern

Chlidonias albostriatus

38-42 cm

black-legged-kittiwake

Rissa tridactyla

30-32 cm

black-naped-tern

Sterna sumatrana

40-45 cm

black-tailed-gull

Larus crassirostris

25-28 cm

blue-noddy

Anous ceruleus

28-30 cm

bonaparte%27s-gull

Larus philadelphia

30-32 cm

bridled-tern

Onychoprion anaethetus

41-45 cm

brown-headed-gull

Larus brunnicephalus

38-45 cm

brown-noddy

Anous stolidus

36-42 cm

brown-hooded-gull

Larus maculipennis

46-55 cm

california-gull

Larus californicus

55-67 cm

caspian-gull

Larus cachinnans

48-60 cm

caspian-tern

Hydroprogne caspia

38-43 cm

chinese-crested-tern

Thalasseus bernsteini

33-43 cm

common-gull-billed-tern

Gelochelidon nilotica

31-35 cm

common-tern

Sterna hirundo

28-33 cm

common-white-tern

Gygis candida

22-24 cm

damara-tern

Sternula balaenarum

42-47 cm

dolphin-gull

Larus scoresbii

39-43 cm

elegant-tern

Thalasseus elegans

55-67 cm

european-herring-gull

Larus argentatus

28-32 cm

fairy-tern

Sternula nereis

35-38 cm

franklin%27s-gull

Larus pipixcan

55-77 cm

glaucous-gull

Larus hyperboreus

50-68 cm

glaucous-winged-gull

Larus glaucescens

64-79 cm

great-black-backed-gull

Larus marinus

45-49 cm

greater-crested-tern

Thalasseus bergii

42-45 cm

grey-gull

Larus modestus

28-32 cm

grey-noddy

Anous albivittus

33-38 cm

grey-backed-tern

Onychoprion lunatus

36-42 cm

grey-headed-gull

Larus cirrocephalus

33-38 cm

gull-billed-tern

Gelochelidon nilotica

36-40 cm

hartlaub%27s-gull

Larus hartlaubii

46-53 cm

heermann%27s-gull

Larus heermanni

50-64 cm

iceland-gull

Larus glaucoides

39-42 cm

inca-tern

Larosterna inca

40-43 cm

indian-skimmer

Rynchops albicollis

40-47 cm

ivory-gull

Pagophila eburnea

54-65 cm

kelp-gull

Larus dominicanus

33-38 cm

kerguelen-tern

Sterna virgata

33-38 cm

large-billed-tern

Phaetusa simplex

36-41 cm

laughing-gull

Larus atricilla

42-45 cm

lava-gull

Larus fuliginosus

21-24 cm

least-tern

Sternula antillarum

51-64 cm

lesser-black-backed-gull

Larus fuscus

35-43 cm

lesser-crested-tern

Thalasseus bengalensis

29-34 cm

lesser-noddy

Anous tenuirostris

25-30 cm

little-gull

Hydrocoloeus minutus

21-25 cm

little-tern

Sternula albifrons

20-25 cm

little-white-tern

Gygis microrhyncha

36-38 cm

mediterranean-gull

Larus melanocephalus

40-46 cm

mew-gull

Larus canus

40-44 cm

olrog%27s-gull

Larus atlanticus

56-66 cm

pacific-gull

Larus pacificus

54-66 cm

pallass-gull

Larus ichthyaetus

22-25 cm

peruvian-tern

Sternula lorata

35-40 cm

red-legged-kittiwake

Rissa brevirostris

44-45 cm

relict-gull

Larus relictus

45-54 cm

ring-billed-gull

Larus delawarensis

38-46 cm

river-tern

Sterna aurantia

33-41 cm

roseate-tern

Sterna dougallii

29-32 cm

ross%27s-gull

Rhodostethia rosea

45-50 cm

royal-tern

Thalasseus maximus

27-33 cm

sabine%27s-gull

Xema sabini

37-43 cm

sandwich-tern

Thalasseus sandvicensis

29-32 cm

saunders%27s-gull

Saundersilarus saundersi

20-23 cm

saunderss-tern

Sternula saundersi

38-42 cm

silver-gull

Larus novaehollandiae

55-67 cm

slaty-backed-gull

Larus schistisagus

37-45 cm

slender-billed-gull

Larus genei

31-35 cm

snowy-crowned-tern

Sterna trudeaui

38-45 cm

sooty-gull

Larus hemprichii

33-45 cm

sooty-tern

Onychoprion fuscatus

33-43 cm

south-american-tern

Sterna hirundinacea

55-60 cm

swallow-tailed-gull

Creagrus furcatus

55-68 cm

western-gull

Larus occidentalis

23-29 cm

whiskered-tern

Chlidonias hybrida

32-34 cm

white-cheeked-tern

Sterna repressa

39-42 cm

white-eyed-gull

Larus leucophthalmus

37-42 cm

white-fronted-tern

Sterna striata

23-27 cm

white-winged-tern

Chlidonias leucopterus

22-25 cm

yellow-billed-tern

Sternula superciliaris

55-65 cm

yellow-footed-gull

Larus livens

52-68 cm

yellow-legged-gull

Larus michahellis