Population by population, species by species, amphibians are vanishing off the face of the Earth. Watch the full episode now.

Allison Argo, the filmmaker behind Frogs: The Thin Green Line, discusses the making of the film in this Web-exlusive video.

(Airs Sunday, April 18) More than a third of all amphibians have already been lost, and more are disappearing every day. A fungus called chytrid has been identified as the major culprit.

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.

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

(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.

Go behind the scenes with me, Allison Argo, as I share stories from the making of Frogs: The Thin Green Line.