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Nature | Frogs: The Thin Green Line - Preview

Frogs: The Thin Green Line - Preview

Learn how large-scale die-offs of frogs around the world have prompted scientists to take desperate measures.

Premiere Date: April 4, 2009 | Runtime: 00:00:30

Season Season 37

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NATURE brings the beauty and wonder of the natural world into your home, becoming in the process the benchmark of natural history programs.