While on his Bus2Antarctica expedition, Andrew Evans spotted something unusual–a black king penguin. The penguin is all black because of melanism. Melanism is an overproduction of melanin, which turns feathers (or skin or fur) dark. Many animal species exhibit melanism, but it’s very rare for penguins–and even rarer to see a penguin exhibiting dark pigment all over its body.

Read more about the black penguin on National Geographic’s Intelligent Travel blog.

Find out more about Andrew Evans’ Bus2Antarctica expedition on National Geographic.

Get the facts on emperor penguins and Adélie penguins.

Photograph courtesy Andrew Evans