Apple is about to release OS X “Leopard,” but isn’t a leopard just a kind of panther? Yes and no. From what I understand, the ambiguity comes from Panthera, the genus name for all of these cats. According to Wikipedia:
In North America, panther means cougar and in South America a panther is a jaguar. Elsewhere in the world a panther is a leopard.
I guess that everyone outside of North America will be wondering what all of the fuss is about.