The Siberian tiger (Panthera tigris altaica), also known as the Amur tiger, is the largest of tiger subspecies. Wild Siberian tigers are found in the Primosky and Khabarovski Krais areas of the Russian Far East, with another small population of about 35 occurring on the Russia-China border. They can weigh up to 660 pounds with males growing up to more than 10.5 ft from head to tail. This photo shows brother Siberian tiger cubs playing hide and seek. (Helen E. Grose - Dreamstime)
A black panther is typically a melanistic color variant of any of several species of larger cat. Wild black panthers in Latin America are black jaguars (Panthera onca), in Asia and Africa they are black leopards (Panthera pardus), and in North America they may be black jaguars or possibly black cougars (Puma concolor – although this has not been proven to have a black variant), or smaller cats.