Vets were hand-feeding the tiny Amur leopard baby at the Yalta Zoo, as the cub is still too young to open its eyes or even walk on four legs. Only 57 Amur leopards, which are listed as "Critically Endangered," are believed to live in the wild as of 2015. Despite the fact that Amur leopard numbers have roughly doubled since 2007, they are still the species of large felines most vulnerable to extinction.