Roland Seitre / Amur tiger (Panthera tigris altaica) walking through snow, captive in zoo. Endangered species.

Vladimir Medvedev,Vladimir Medvedev / Amur / Siberian Tiger (Panthera tigris altaica) female in the wild, on a hillside, Lazovskiy zapovednik / Lazo Reserve protected area, Primorskiy krai, Far Eastern Russia, February 2012

Tim Fitzharris / Siberian Tiger (Panthera tigris altaica) running, native to Russia

Mark Carwardine / Siberian / Amur tiger (Panthera tigris altaica) yawning, Male rescued from poachers, ÊUtyos Wildlife Rehabilitation Centre, Kutuzovka Village, Russian Far East, in taiga forest, Endangered species

Mark Carwardine / Siberian / Amur tiger (Panthera tigris altaica). Male rescued from poachers, ÊUtyos Wildlife Rehabilitation Centre, Kutuzovka Village, Russian Far East, in taiga forest, Endangered species

Vladimir Medvedev / Camera trap image of wild Siberian tiger (Panthera tigris altaica) walking through woodland, Lazovsky Zapovednik Nature Reserve, Primorsky Krai, Far East Russia, November 1994

Vladimir Medvedev / Camera trap image of wild female Siberian tiger (Panthera tigris altaica) scent marking the trunk of a Cedar (Cedrus) tree, Lazovsky Zapovednik Nature Reserve, Primorsky Krai, Far East Russia, April...

Nature Production / Siberian tiger (Panthera tigris altaica) walking in snow in woodland, Gaivoron, Russia Endangered species

Andy Rouse / Siberian Tiger (Panthera tigris altaica) walking on snow. Captive. (non-ex)

Andy Rouse / Siberian Tiger (Panthera tigris altaica) running in snow. Captive. (non-ex)

Konstantin Mikhailov / Young Siberian tiger (Panthera tigris altaica) in snow, Captive, Moscow Zoo, Endangered species

Edwin Giesbers / Siberian tiger (Panthera tigris altaica) detail of patterns surrounding the eye, captive.