Mountain goats are a fairly recent addition to Yellowstone compared to some of the other animal species that can be found there. They are not native to Yellowstone National Park and have only been ...

Photograph by Michael Nichols The comeback of a surprising number of other animals can be linked to Greater Yellowstone’s role as a refugium for species that have been doomed in parts of the ...

The bison population in Yellowstone National Park is the nation's largest population of bison on public land. As a keystone ...

When the federal government set aside the Greater Yellowstone Ecosystem ... of these and other plant species not only caused the loss of habitat for many other animals but also influenced other ...

Yellowstone bison now breed as one interlinked population. Genetic studies show strong gene flow across all bison herds.

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park. Find more at natgeo ...

Bison back up. It’s an animal-eat-animal world out there, especially in Yellowstone National Park. There are almost 70 different mammal species in Yellowstone, and most of those can be separated into ...

YELLOWSTONE NATIONAL PARK, Wyo. — Snow crunched underfoot as Mark Hebblewhite scanned the ridgelines of Canada’s Banff National Park. It was 1995, and the young biologist, fresh out of undergrad, was ...