Toads and Evolution

Tiny spadefoot toads show scientists how they make drastic changes in their forms and behaviors in response to their environment.

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State(s) featured in this episode: Colorado

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State(s) featured in this episode: Colorado

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State(s) featured in this episode: Colorado

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In Colorado, with fast population growth in the Denver area and fierce competition for water, investors are behind a plan to import water from a mountain valley hundreds of miles away, a plan opposed by farmers and ranchers who depend on water in that valley. Gary Strieker reports.