Collected and protected by dedicated scientists, these animals represent the end of the line for their species. Watch the full episode now.

Up to 100 species disappear from the planet each day. In this web-exclusive video, scientists and conservationists discuss the importance of biodiversity.

(Airs Sunday, March 7) Around the globe, unique and fascinating species face extinction. Follow the plight of these creatures and the dedicated conservationists who fight for them.

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

(Airs Sunday, July 5) Africa's lion population appears to be declining at an alarming rate.

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.

This video enhanced lesson uses excerpts from the NATURE film “Tall Blondes” to illustrate the effects of wildlife conservation and relocation, using giraffes as an example. (Grades 5-8)