View full lesson: 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.

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