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Biologists say wolf packs have contributed to the decline in Yellowstone elk numbers over the last 30 years since they were reintroduced to the park, but many also say that the elk population before ...

Thirty years ago, park rangers reintroduced grey wolves into Yellowstone National Park. They wanted to restore the ecosystem and get the elk... How the wolf changed Yellowstone 30 years after ...

In Yellowstone’s wild chess match between wolves and cougars, it turns out the real power play is theft. After tracking nearly a decade of GPS data and thousands of kill sites, researchers found that ...

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, ...