Cats are known for their expressive vocals. Whether it be a gentle purr while couch cuddling, a meow at your legs while ...

Each wolf has a unique vocal "fingerprint," allowing other pack members to identify exactly who is calling from a distance.

The wolves’ diverse territory also included the San Luis Valley; the mountains near Vail, Aspen and Leadville; and the hills and ranchland around Walden.

Frank Glaser, a legendary frontiersman and government trapper, spent nearly 40 years among wolves — and tracking down facts about wolf attacks. Here's what he learned ...