![[A black wolf stands in snow, facing left. It is looking at the camera. There is snow on its muzzle and back leg.]](https://blogs.iu.edu/sciu/files/2022/05/black-wolf-sciu-yell-pic.jpg)
Recently, a trail camera in northern Minnesota caught video of a pack of all-black wolves. The video has been viewed more than 950,000 times since it was uploaded in late December 2021. A greyish-brown wolf crosses the meadow in the shot, followed by three all-black wolves. People are fascinated. So, what affects animal coloration? And why are these wolves black?