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

Since 2023, Jeff Reed has been working with scientists at the Yellowstone Wolf Project to record and understand wild wolves' barks, growls and howls.

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 ...