The Siberian tiger (Panthera tigris altaica), also known as the Amur tiger, is a tiger subspecies inhabiting mainly the Sikhote Alin mountain region with a small subpopulation in southwestPrimorye province in the Russian Far East. In 2005, there were 331–393 adult-subadult Amur tigers in this region, with a breeding adult population of about 250 individuals. The population has been stable for more than a decade due to intensive conservation efforts, but partial surveys conducted after 2005 indicate that the Russian tiger population is declining.[1]

The Siberian tiger is the largest living felid and ranks among the biggest felids to ever exist.[2]

Phylogeographic analysis with extant tiger subspecies suggests that less than 10,000 years ago the ancestor of Amur and Caspian tigers colonized Central Asia via the Gansu−Silk Roadcorridor from eastern China then subsequently traversed Siberia eastward to establish the Amur tiger population in the Russian Far East.[3]