The Siberian Tiger

The Siberian tiger is a tiger native to the Russian Far East, Northeast China, and possibly North Korea. It once ranged throughout the Korean Peninsula, north China, and eastern Mongolia. The population currently inhabits mainly the Sikhote-Alin mountain region in southwest Primorye Province in the Russian Far East. In 2005, there were 331–393 adult and subadult Siberian tigers in this region, with a breeding adult population of about 250 individuals. The population had been stable for more than a decade because of intensive conservation efforts, but partial surveys conducted after 2005 indicate that the Russian tiger population was declining.

The Siberian is the largest of the tigers and males can exceed 700 lbs., larger than a male lion. My question is why is does such a large animal exist is such a cold climate? Typically the largest animals favor a warmer climate.