White tigers are hunted by poachers and used for Chinese medicine. The white tiger is not a species unto itself so cannot be classed as endangered. It is a genetic flaw of the Bengal tiger, and extremely rare. This Is Not A Tiger, ; It's a Leopard !
Since the it has been considered politically incorrect to call a black cat a black panther. The big black cats are black leopards or black jaguars and are not referred to as black panthers by anyone who knows anything about big cats.