Thirty years ago, park rangers reintroduced grey wolves into Yellowstone National Park. They wanted to restore the ecosystem and get the elk population, which had decimated the plant community, in ...

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, ...

Reintroducing grey wolf populations to the wild has been a controversial topic. Researchers studying grey wolf populations in Yellowstone National Park have discovered an intriguing reason why some ...