The apex predators, restored to the park in 1995, appear to be keeping the local population of plant-eating elk in check, ...

The National Park Service is clearing up any misconceptions on whether wildlife is migrating away from Yellowstone National ...

In this Aug. 3 photo, Heidi Anderson, director of the Yellowstone National Park Herbarium speaks about plants, in the Heritage and Research Center in Gardiner, Montana.

Gray wolves were reintroduced in Yellowstone National Park in 1995 to help control the numbers of elk that were eating young ...

Yellowstone National Park officials have created a plan to manage a variety of invaders that continue to threaten the 2.2 million-acre caldera and want to know what the public thinks.

Scholars and schoolchildren alike have generally classified animals by the foods they eat: carnivores eat meat; browsers consume flowering plants, conifers and shrubs; and grazers focus on grasses.

For the first time in 80 years, aspen trees are thriving in Yellowstone National Park in the US, due mostly to the ...

This Aug. 20, 2017 photo shows the exterior of the Yellowstone National Park Herbarium in the Heritage and Research Center in Gardiner, Mont. (Mark Davis /The Powell Tribune via AP) more > ...

In this Aug. 3, 2017 photo, Heidi Anderson, director of the Yellowstone National Park Herbarium speaks about plants, in the Heritage and Research Center in Gardiner, Mont.