Why is the black panther becoming extinct?

Answer 1

"Black panthers" are merely melanistic (black) specimens of the leopard (Panthera Pardus) or the jaguar (Panthera Onca). There is no such thing as a "Black Panther" species, and, as neither the leopard or jaguar is endangered at the moment, neither are the black members of those species.

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Black panthers are more of a genus than of a species. So you've gotten that part right, but don't say that black panthers don't exist, because they ARE real.

Answer 2

Black panthers are merely color phases of the leopard and jaguar, and neither species is considered endangered at this point.