A BLACK LEOPARD --notice you can see the leopard markings. A "black panther" is not its own species—it's an umbrella term that refers to any big cat with a black coat. Cats called Black Panthers have spots too, they are just harder to see.
**Editors Note: this photo has been tampered with, black lions do not exist** The opposite of albinism called melanism, a recessive trait where the skin and fur are all black. This is perhaps the most beautiful lion I have ever seen.