Claudio Contreras / California condor (Gymnogyps californianus), portrait. California condor recovery program, Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico.

Claudio Contreras / California condor (Gymnogyps californianus), two peched in tree, adult and juvenile. California condor recovery program, Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico.

Heather Angel / Giant panda (Ailuropoda melanoleuca) portrait, in falling snow. Captive bred, in enclosure, Panda Breeding Centre, Wolong, Sichuan Province, China. February 2008.

Suzi Eszterhas / Giant panda (Ailuropoda melanoleuca) sitting with Bamboo in background. Shenshuping Panda Base, Wolong Nature Reserve, Wenchuan, Sichuan Province, China. Captive.

John Chan / Juvenile California least tern (Sternula antillarum browni) begging for food from a decoy, used to attract breeding pairs to deserted nest sites, Huntington Beach, California, USA, June.

Nick Upton / European eel (Anguilla anguilla) elver migrating upstream, using an eel pass on the side of a weir, Somerset Levels, England, UK, July.

Eric Baccega / Giant panda (Ailuropoda melanoleuca) cub playfuly chewing a bamboo stick. Yuan Meng, first giant panda ever born in France, is now 10 months old and still feeds on his mother's milk, Captive at Beauva...

Eric Baccega / Giant panda cub (Ailuropoda melanoleuca) portrait Yuan Meng, first giant panda ever born in France, age 10 months. Captive at Beauval Zoo, Saint Aignan sur Cher, France

Eric Baccega / Giant panda (Ailuropoda melanoleuca) cub playing on wooden structure. Yuan Meng, first giant panda ever born in France, age 10 months, Captive at Beauval Zoo, Saint Aignan sur Cher, France

Eric Baccega / Giant panda (Ailuropoda melanoleuca) cub playing on wooden structure. Yuan Meng, first giant panda ever born in France, age 10 months, Captive at Beauval Zoo, Saint Aignan sur Cher, France

Eric Baccega / Giant panda (Ailuropoda melanoleuca) cub exploring during its outings in the enclosure. Yuan Meng, first giant panda ever born in France, age 10 months, Captive at Beauval Zoo, Saint Aignan sur Cher,...

Eric Baccega / Giant panda (Ailuropoda melanoleuca) female, Huan Huan, out in her enclosure in mist, Captive at Beauval Zoo, Saint Aignan sur Cher, France. The mist is created artificially by machine, in order to cr...