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 ...

Ecologists Robert Beschta and William Ripple later documented the ecological consequences of this imbalance. Their research showed that prolonged overgrazing reduced the height and density of riparian ...

Yellowstone National Park is often told as a story of recovery. Wolves returned and then elk changed their behavior. Willows and aspens then rebounded and rivers, it is said, changed course. The ...