A man approached a pack of wolves in Yellowstone National Park as visitors watched in horror from far away. Keith Allen Kerbs, who took video of the man, was taking pictures of the five black wolves when the man walked toward the animals. At one point, he was spraying bear spray at the wolves, and eventually managed to escape. The National Park Service said there have been no reports of wolves attacking humans in Yellowstone, but has still advised visitors not to approach them. | CBS News

This is what 51 wolves howling sounds like <3 | Wolf Conservation Center

This is what 50 wolves howling sounds like. | Wolf Conservation Center

Why do wolves howl? The howl of the wolf is one of nature's most evocative and powerful sounds. The haunting chorus of wolves howling is beautiful – or frightening, depending on one’s point of view. Wolves howl to communicate with one another. They locate members of their own pack by howling, and they often engage in a group howl before setting off to hunt. The howl is a clear warning to neighboring wolves to stay away. The howl of the wolf is one of nature's most evocative and powerful sounds.