There are less than 400 of these endangered Siberian tigers living in the remote regions of Far East Russia. Fortunately, they populate well in captivity. Collectively, the U.S. and China manage more than 8,000. This beautiful feline is at the Antwerp Zoo. The average Amur tiger ranges from 250 to 500 pounds but a few can weigh over 800 pounds, so they have no fear attacking brown and black bears in the wild.