Stephane Granzotto / Alpine marmot (Marmota marmota) standing alert outside burrow, takes fright and runs inside, Rhone-Alpes, France, July.

Sven Zacek / Grass Snake (Natrix natrix) looking out from between wood slats. Estonia, Europe, June.

Andy Rouse / Burchell's Zebra (Equus quagga) foal hiding under its mother's tail. Masai Mara, Kenya.

Mark Bowler / Three-banded Armadillo (Tolypeutes tricinctus) rolled up in defensive posture. Captive. Endemic to Brazil.

Juergen Freund / Blue linkia starfish (Linckia laevigata) pair attached to the dead part of coral, New Ireland, Papua New Guinea

Edwin Giesbers / Orang utan (Pongo pygmaeus) head portrait of dominant male called Richie, Semengoh Nature reserve, Sarawak, Borneo, Malaysia, Endangered

Michael Pitts / Barbary macaque (Macaca sylvanus) in threat display with person looking scared, on the cable car lift, Gibraltar, December.

Diane McAllister / Japanese Macaques (Macaca fuscata) mothers guarding their babies as other monkeys approach down the hillside in Jigokudani, Japan.

Neil Aldridge / Vet working for the Endangered Wildlife Trust fastening a pheromone imbued calming collar around the neck of a tranquilized African wild dog (Lycaon pictus), these collars are designed to soothe dogs...

Neil Aldridge / Vet working for the Endangered Wildlife Trust placing a pheromone imbued calming collar around the neck of a tranquilized African wild dog (Lycaon pictus), these collars are designed to soothe dogs i...

Edwin Giesbers / Grey wolf (Canis lupus) portrait with ears laid back in back, in standing on rocky outdrop, in the rain, captive

Suzi Eszterhas / Rescued Chimpanzees (Pan troglodytes) showing fearful expressions, Ngamba Island Chimpanzee Sanctuary, Uganda, Africa. Captive, June 2009.