White Tern, Gygis alba "White Tern" by Angrysunbird via Flickr, Creative Commons Attribution ShareAlike.	Larosterna inca Rubund Creative Commons Attribution ShareAlike.
Common Tern, Sterna hirundo "Common Tern (Sterna hirundo)" by Ian.white1 via Flickr, Creative Commons Attribution-NoDerivs.	Arctic Tern, Sterna paradisaea Rubund Creative Commons Attribution ShareAlike.
Royal Tern, Thalasseus maximus "Royal Tern (Thalasseus maximus syn. Sterna maxima), Morro Strand State Beach, Morro Bay, CA" by Mikebaird via Flickr, Creative Commons Attribution.

Taxonomy:

Anous minutus (Add)
Anous stolidus (Add)
Anous tenuirostris (Add)

Chlidonias albostriatus (Add)
Chlidonias hybridus (Add)
Chlidonias leucopterus (Add)
Chlidonias niger (Add)

Gelochelidon nilotica (Add)

White Tern, Gygis alba

Gygis microrhyncha (Add)

Hydroprogne caspia (Add)

Larosterna inca

Onychoprion aleuticus (Add)
Onychoprion anaethetus (Add)
Onychoprion fuscatus (Add)
Onychoprion lunatus (Add)

Phaetusa simplex (Add)

Procelsterna albivitta (Add)
Procelsterna cerulea (Add)

Sterna acuticauda (Add)
Sterna albifrons (Add)
Sterna albostriata (Add)
Sterna anaethetus (Add)
Sterna antillarum (Add)
Sterna aurantia (Add)
Sterna balaenarum (Add)
Sterna bengalensis (Add)
Sterna bergii (Add)
Sterna bernsteini (Add)
Sterna dougallii (Add)
Sterna elegans (Add)
Sterna forsteri (Add)
Sterna fuscata (Add)
Sterna hirundinacea (Add)
Common Tern, Sterna hirundo

Sterna lorata (Add)
Sterna maxima (Add)
Sterna nereis (Add)
Arctic Tern, Sterna paradisaea

Sterna repressa (Add)
Sterna sandvicensis (Add)
Sterna saundersi (Add)
Sterna striata (Add)
Sterna sumatrana (Add)
Sterna superciliaris (Add)
Sterna trudeaui (Add)
Sterna virgata (Add)
Sterna vittata (Add)

Thalasseus bergii (Add)
Thalasseus elegans (Add)
Royal Tern, Thalasseus maximus

Thalasseus sandvicensis (Add)