The black fur allele has fitness costs but also confers higher immunity against canine distemper ... But in North America, especially in Yellowstone National Park where a large amount of wolf research ...

WARSAW, Poland (AP) — Two rare black wolves, likely siblings, were spotted on camera crossing a stream in a Polish forest, a conservation organization said Sunday. The unusual sighting, captured ...

Two rare black wolves, likely siblings, were spotted on camera crossing a stream in a Polish forest, a conservation organization said Sunday. The unusual sighting, captured last year on a video camera ...

The gray wolf, also known ... Its winter fur is long and bushy, and predominantly a mottled gray in color, although nearly pure white, red, or brown to black also occur.