FACT OF THE WEEK: There is no single cat called the panther. The name is commonly applied to the leopard, but it is also used to refer to the puma and the jaguar. A black panther is really a black leopard.
It would have only taken a few seconds to look that up in a dictionary:
pan•ther "pan(t)-ther\ noun pl panthers also panther [ME pantere, fr. OF, fr. L panthera, fr. Gk panther] (13c)
1 : leopard: as
a : a leopard of a hypothetical exceptionally large fierce variety
b : a leopard of the black color phase
2 : cougar
3 : jaguar