Pedro Narra / Little Tern (Sterna albifrons) feeding chick, Sado Estuary, Portugal. June

John Chan / Male California Least Tern (Sternula antillarum browni) courting a female, presenting a fish before chasing off another male, Huntington Beach, California, USA, May.

Ann & Steve Toon / Arctic tern (Sterna paradisaea) with sandeel. Inner Farne, Northumberland, UK. July.

Alan Murphy/ BIA / Forster's Tern (Sterna forsteri) flying, Texas

Sven Zacek / Arctic tern (Sterna paradisea) sitting on its nest surrounded by various coastal colors. Harjumaa, Estonia. June.

Ole Jorgen Liodden / Arctic tern (Sterna paridisea) mobbing, Arctic fox (Alopex lagopus) in Spitsbergen, Svalbard, Norway, July.

Bruno de Faveri / Arctic Tern (Sterna paradisaea) with begging chick, Farne Islands, England, United Kingdom

Ole Jorgen Liodden / Arctic tern (Sterna Paradisaea) flying, Svalbard, Norway, July.

Marie Read / Royal terns (Sterna maxima) pair crossing bills during courtship behaviour, Fort DeSoto Park, Florida, USA

Markus Varesvuo / Arctic Tern (Sterna paradisaea) hovering in flight, June, Iceland. Magic Moments book plate.

Theo Bosboom,Theo Bosboom / Arctic tern (Sterna paradisae) on telegraph lines, near a small village on the Reykjanes peninsula in the south west of Iceland, June

Orsolya Haarberg / Arctic tern (Sterna paradisaea), adult feeding young. Jokulsarlon glacial lagoon. Iceland. August 2008