With only 20 to 30 Amur tigers remaining in the 1930s, the graceful Siberian animal was on the brink of extinction. Today, thanks to the work of conservationists, there may be more than 500 Amurs living in the wild Siberian terrain. The reversal is encouraging, but the World Wildlife Fund is not completely satisfied, which is why the organization has launched an appeal that aims to boost the tiger population to more than 6,000 by 2022. The plan is, amongst other things, to expand reserves in the wild where tigers can mix and breed in great numbers while clamping down on poachers in the region.