From helping them find mates to bettering their ability to camouflage, marks on animals and birds serve various purposes.

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. Scientists ...

Huge meat-eating dinosaurs and their plant-eating prey shared the same watering holes on Skye 167 million years ago, say scientists. University of Edinburgh researchers examined dozens of dinosaur ...

"It could be albino, but it could also be leucistic; the differences between the two pigment disorders are difficult to tell without being very close to the animal." Iowans have spotted both ...

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. Scientists ...