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

Meet some of the people featured in The Loneliest Animals, who are working to prevent species extinction around the world.

In China, the last female rafetus turtle is about to be introduced to her new home, where the last male is waiting to meet her.

(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.

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.

Because Javan gibbons mate for life, matching breeding pairs is a difficult process for these scientists.

For some of the loneliest animals on the planet, captive breeding programs and human intervention may the only hope.