For the first time in 80 years, a new generation of fully-fledged aspen trees has grown in Yellowstone’s northern range.

Reintroduction of the gray wolf to Yellowstone National Park has boosted an important food source for the threatened grizzly bear, researchers have found in an example of how the return of a top ...

Yellowstone National Park is celebrating an ecological milestone along with a key anniversary this summer, Oregon State ...

A grizzly bear roams near Beaver Lake in Yellowstone National Park. A new study has found that the percentage of nutritious berries rose in the diet of grizzlies after wolves returned to the park.

Food webs broke down. "Before the wolves came back, it was pretty clear that in some areas we were heading towards an outright extinction of cottonwoods," Beschta said.

The return of wolves to Yellowstone National Park long has been credited with replenishing its wetlands and ... “It’s pretty well known that if you take apex predators out of food webs, ...

Wolves being introduced to Yellowstone in January 1995. OOL/AFP/Getty Images. He said the "unexpected" ecological consequences seen at Yellowstone following the wolf reintroduction shows how a ...

This Nov. 7, 2017, photo released by the National Park Service shows a wolf in the road near Artist Paintpots in Yellowstone National Park, Wyo. Wolves have repopulated the mountains and forests of ...

Video shows adult wolves in Yellowstone trotting back to their den “with some interesting items” — twigs, tree branches, antlers and bones, some of which are almost comically large.

Food webs broke down. "Before the wolves came back, it was pretty clear that in some areas we were heading towards an outright extinction of cottonwoods," Beschta said.

Video shows adult wolves in Yellowstone trotting back to their den “with some interesting items” — twigs, tree branches, antlers and bones, some of which are almost comically large.

Video shows adult wolves in Yellowstone trotting back to their den “with some interesting items” — twigs, tree branches, antlers and bones, some of which are almost comically large.