Wolves usually rely on cooperation to survive. Hunting large prey such as elk typically involves multiple pack members working together to isolate and exhaust an animal. That reality makes one ...

Over the last three decades, Yellowstone National Park has undergone an ecological cascade. As elk numbers fell, aspen and willow trees thrived. This, in turn, allowed beaver numbers to increase, ...

When gray wolves returned to Yellowstone National Park, the public heard a simple story: predators came back, balance ...

A new study documents the complex interactions between cougars and gray wolves in Yellowstone National Park and finds their ...

Add Yahoo as a preferred source to see more of our stories on Google. Mature elk can run 40 mph when they become so inspired, and recent footage from Yellowstone National Park shows that young elk are ...

A baby elk outran — and outswam — a wolf pack in Yellowstone National Park, video shows. Screenshot of montanawild_'s Instagram video A “brave” little elk calf sprinted to safety — with a pack of ...

This winter saw the most wolves from Yellowstone National Park killed in about a century. That's because states neighboring the park changed hunting rules in an effort to reduce the animals' numbers.