Jordi Chias / Juvenile Hawksbill turtle (Eretmochelys imbricata) released by biologist after being tagged, Cayman; Cayman Islands Archipelago.

Will Watson / Black Welsh Mountain sheep portrait, Herefordshire, UK

Andy Rouse / Osprey (Pandion haliaetus) young male 'Einion' in flight. The bird is wearing a radio tracker. Dyfi Estuary, Wales, August. It is the first time ospreys have bred at this location for 400 years.

Pete Oxford / Small Ground Finch (Geospiza fuliginosa) being ringed for Avian pox research, Puerto Ayora, Santa Cruz Island, Galapagos, endemic

Juergen Freund / Chambered nautilus (Nautilus pompilius) with radio transmitter, Indo-pacific

Juergen Freund / Richard Fitzpatrick releases Grey reef shark {Carcharhinus amblyrhynchos} after inserting transmitter into its belly, as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008

Wild Wonders of Europe / Oxford / Wild Iberian lynx (Lynx pardinus) male, one year, with GPS tracking collar, sitting, Sierra de Andjar Natural Park, Mediterranean woodland of Sierra Morena, north east Jan Province, Andalusia, Spain,...

Wild Wonders of Europe / Unterthiner / Young Eleonora's falcon (Falco eleonorae) being ringed by researchers from the Hellenic Ornithological Society, Andros, Greece, September 2008

Steven Kazlowski / Curious subadult Polar bear (Ursus maritimus) tagged 300-400 lb. along the Arctic coast during the autumn freeze up, 1002 area of the Arctic National Wildlife Refuge, Beaufort Sea, Alaska, October 200...

Pete Oxford / Whale Shark (Rhincodon typus) swimming with other tropical fish, note satellite tag to right of dorsal fin, Wolf Island, Galapagos Islands, Ecuador

Yva Momatiuk & John Eastcott / California Condor (Gymnogyps californianus) adult with wingspan of 9 feet flying, critically endangered, bred in captivity, later released, and wearing radio transmitter, near Zion National Park, Utah

Mike Parry / Great White Shark (Carcharodon carcharias) open jaw, Neptune Islands, South Australia