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 ...

Video still showing a rare black wolf crossing a stream in a Polish forest ... In its pale speckled form it mimicked lichen patches on tree trunks. Prior to England’s Industrial Revolution ...

For most animal biologists, seeing an all-black variant of their studied species would be a once-in-a-lifetime experience. But in North America, especially in Yellowstone National Park where a large ...