Sterna - Species Dictionary - Global : iSpot Nature - Your place to share nature. iSpot is a website aimed at helping anyone identify anything in nature. Once you've registered, you can add an observation to the website and suggest an identification yourself or see if anyone else can identify it for you.

Catalogue of Life
Animalia, Chordata, Aves, Charadriiformes, Laridae, Sterna
Sterna trudeaui, Sterna forsteri, Sterna hirundo, Sterna paradisaea, Sterna dougallii, Sterna acuticauda, Sterna aurantia, Sterna hirundinacea, Sterna repressa, Sterna striata, Sterna sumatrana, Sterna virgata, Sterna vittata