But the huge fire of 1988 ultimately produced few large trees. The elimination of Yellowstone's wolves allowed the elk to browse aspens unchecked. Finally, Ripple and Larson decided to look within ...

But first, we need you to sign in to PBS using one of the services ... the nation's first national park, Yellowstone. Yellowstone is a great example of how wolves impact their environment.

His film work has aired on PBS’s Nature ... s wolf pack investigates grizzly bear tracks in Yellowstone’s Pelican Valley. Wolves were reintroduced into the park beginning in 1995, and ...

With this performance taking place in the middle of the night, near the wolves’ den, researchers would usually have missed it. But the scientists of the National Park Service’s Yellowstone ...

The bear known as Grizzly 399, who PBS dubbed the "most famous grizzly ... resident of the Grand Teton National Park, located ...