Unusual predator standoff: Video shows grizzlies and wolves confronting each other over a bison carcass in Yellowstone’s LeHardys Rapids, with aggressive displays but no injuries. Why it’s rare: ...

Studies in the park’s Northern Region have estimated that wolf survival is due in large part to that reliable source of bison meat, composing as much as one-quarter to one-third of a wolf’s scavenging ...

A herd of bison in Yellowstone National Park decided that the best defense is a good offense, so it worked together to chase off two wolves from a pack known to hunt bison "before they got any ideas." ...