View full lesson: http://ed.ted.com/lessons/disappearing-frogs-kerry-m-kriger

Frogs (and amphibians in general) are in danger -- worldwide, nearly one-third of the world's amphibian species are on the verge of extinction. And yet, frogs contribute to our well-being in many important ways. Kerry M. Kriger describes why frogs are in trouble and how you can help save them.

Lesson by Kerry M. Kriger, animation by Simon Ampel.