Two rare black wolves were filmed crossing a stream in a Polish forest, according to the SAVE Wildlife Conservation Fund Poland. The footage, recorded last year by project coordinator Joanna Toczydłowska (pronounced Toh-chih-DWOFF-ska), is unusual because most of Poland’s 2,500 to 3,000 wolves have gray fur with black or red markings. In the video, one black wolf and one gray wolf wade through the water. Another clip later captured two black wolves and a gray wolf in the same area. Experts believe the black fur comes from a genetic mutation inherited from domesticated dogs thousands of years ago. Since black wolves are rare, conservationists have not shared the exact location to protect them from poachers and misinformation. After this discovery, researchers began collecting wolf scat in the area to study their DNA. They want to learn more about the black fur mutation and its presence in Europe, where it is uncommon due to limited genetic diversity. Poland’s wolves nearly vanished by the 1950s but have rebounded since the early 2000s. Scientists emphasize educating the public about living alongside wolves. The conservation fund is also raising money for further genetic research.