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

Jabruson / Mozambican children with captive Yellow Baboon youngster (Papio cynocephalus). Young animal caught during troop crop raiding. Pemba to Montepuez highway, north-eastern Mozambique, November 2011. Wildl...

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

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) mother and one year cub in fog, afraid of male grizzly bear near by, Lake Clark National Park, Alaska.

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) mother and one year cub alert in fog, afraid of male grizzly bear near by, Lake Clark National Park, Alaska.

Alex Mustard / A pair of Atlantic trumpetfish (Aulostomus strigosus) shadow hunting, swimming above a Dusky grouper (Epinephelus marginatus). Tiny fish are not afraid of the grouper and allow it to swim clos and t...

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.

Petra Wegner / Border Collie, bitch, shy, afraid in straw

Igor Shpilenok / Many Red Foxes (Vulpes vulpes) in Kronotsky Zapovednik are not afraid of humans and will approach people. Kronotsky Zapovednik Nature Reserve, Kamchatka Peninsula, Russian Far East, August.

Suzi Eszterhas / Chimpanzee (Pan troglodytes) male showing fear grimace after bout of aggression, tropical forest, Western Uganda

Petra Wegner / Brindled Sloughi head with ears down shy, afraid