When a leopard carries two copies of the melanism gene, it results in a black panther. However, it's important to note that not all leopards are melanistic, and black panthers are not a distinct species. They belong to the same species as regular spotted leopards but exhibit a different color variation.
Black panthers are more common in certain regions, such as the dense forests of Southeast Asia, but they can also be found in other parts of the world where leopards are native. Despite their striking appearance, black panthers have the same behavior, hunting patterns, and ecological roles as spotted leopards.
In summary, black panthers are not a separate species but rather a color variant of leopards caused by a genetic mutation called melanism. They belong to the same species, Panthera pardus, as spotted leopards.