Two rare black wolves, likely siblings, were spotted on camera crossing a stream in a Polish forest, a conservation ...

The unusual sighting, captured last year on a video camera set up by SAVE Wildlife Conservation Fund Poland project ...

Two rare black wolves, likely siblings, were spotted on camera crossing a stream in a Polish forest ... dark fur is rare in Europe due to a reduced genetic diversity, but at least half of the wolf ...

In one clip, a black wolf and a gray wolf slowly crossed a stream in the forest, the water nearly up ... dogs thousands of years ago. The dark fur is rare in Europe due to a reduced genetic ...

This image made from video provided by SAVE Wildlife Conservation Fund Poland shows a rare black wolf crossing a stream in a Polish forest last summer. (SAVE Wildlife Conservation Fund Poland via AP) ...

A rare black wolf crossing a stream in a Polish forest last summer (SAVE Wildlife ... in domesticated dogs thousands of years ago. The dark fur is rare in Europe due to a reduced genetic diversity ...