Seafarers on a 2012 National Geographic-Lindblad expedition to Antarctica spotted this rare "blond" chinstrap penguin in a colony on Aitcho Island.

The condition is known as isabellinism or leucism (like "leukocyte," or white blood cells), and not albinism, where no melanin is produced. Animals with isabellinism have a genetic mutation that dilutes pigments in the feathers, according to a 2009 study in Marine Ornithology. Though technically separate conditions, isabellinism and leucism are used interchangeably. Leucistic birds have a mutation that restricts the dissemination of pigment to feathers.

Here's the video: 

[Via National Geographic]