Learn about the various wolf packs of Yellowstone National Park.

Watch the full episode of The Good, the Bad, and the Grizzly online now.

The Yellowstone grizzly bear was removed from the Endangered Species List in 2007. Their population continues to grow, increasing by 4 to 7 percent a year, but conflicts remain.

Shane Moore has been documenting the natural world for nearly three decades, producing detailed studies of complex ecological problems around the world.

(Airs Sunday, September 13) NATURE's The Good, the Bad and the Grizzly looks at the grizzly bear's remarkable recovery and examines the controversy behind the conservation success story.

Should cloning be used to save lions? That is the question some conservationists are pondering as lion populations dwindle worldwide.

This lesson uses clips from NATURE's episode "The Loneliest Animals" to explore a variety of captive breeding programs. (Grades 5-8)

These clips from NATURE's episode, "The Loneliest Animals" are used to explore a variety of captive breeding programs.

Using segments from NATURE's "The Wolf that Changed America" students will explore 19th century attitudes toward wolves in the western United States. (Grades 9-12)

These video segments from NATURE's "The Wolf that Changed America" explore 19th century attitudes toward wolves in the western United States.