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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 ...

In Yellowstone National Park — where gray wolves were reintroduced starting in 1995 — researchers have gone back and forth on whether the restoration of wolves has impacted the ecosystem. The idea is ...

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 ...

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.

Wolves Weekend is a celebration of the IMAX film Lost Wolves of Yellowstone.

For the past 15 years, Luke Painter has been traveling to the northern range of Yellowstone National Park, where mountains rise and tributaries carve valleys of sage, willows and trees. This includes ...

Faced with the quandary of how to get mountain lions out of trees for scientific analysis, researchers dosed them with ketamine, then climbed up to ...

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 ...

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, ...