Ole Jorgen Liodden / Arctic tern (Sterna paradisaea) attacking an Arctic Fox (Vulpes / Alopex lagopus) protecting its nest site, Spitsbergen, Svalbard, Norway. Highly commended, MAMMALS, GDT 2011 competition

Shane Gross / Pelagic thresher shark (Alopias pelagicus) cleaned by a Bluestreak cleaner wrasse (Labroides dimidiatus) at Monad Shoal off Malapascua Island, Philippines.

Shane Gross / Pelagic thresher shark (Alopias pelagicus) being cleaned by a bluestreak cleaner wrasse (Labroides dimidiatus) at Monad Shoal off Malapascua Island, Philippines.

Laurent Geslin / Red fox (Vulpes vulpes) carrying Brown trout (Salmo trutta) found near a fishing pond, England

Ian Coleman / Illustration of Common thresher shark (Alopias vulpinus), Alopiidae. Endangered / threatened species.

Wild Wonders of Europe / de la Lez / Arctic fox (Alopex lagopus) with Common guillemot (Uria aalge) prey, Alkehornet, Svalbard, Norway, July 2008

Juergen Freund / Fishermen bring thresher shark {Alopias vulpinus} to the surface, Philippines

Juergen Freund / Thresher shark {Alopias vulpinus} caught on line, Philippines

Shane Gross / Pelagic thresher shark (Alopias pelagicus) cleaned by Bluestreak cleaner wrasse (Labroides dimidiatus) at Monad Shoal off Malapascua Island, Philippines.

Pascal Kobeh / Pelagic thresher shark (Alopias pelagicus) on the reef with its long tail being cleaned by a cleanerfish, Sulu Sea, Philippines.

Pascal Kobeh / Pelagic thresher shark (Alopias pelagicus) Sulu Sea, Philippines.

Pascal Kobeh / Pelagic thresher shark (Alopias pelagicus) with its long tail, Sulu Sea, Philippines.