Some animals, like mantis shrimp and birds, can perceive a world of color that is completely invisible to humans. Bees and many other insects see wavelengths from 300 nm to 650 nm, meaning they ...

In animals, loss-of-function mutations in the MC1R gene can result in light, yellow or reddish coat color. In humans, in MC1R, leading to hair that ranges from strawberry blonde to copper.

On the other side of the spectrum are white spirit bears, a leucistic version of an American black bear, Ursus americanus. There are also albino animals that lack most or all pigment.

Move over, black panther—there’s a white cougar in the limelight. Photographs recently resurfaced of a ghostly young male striding through Serra dos Órgãos National Park in southeastern ...