Hanson, Thor

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1 segment

September 4, 2012

19:36

Conservation Biologist Explains Why 'Feathers' Matter

Thor Hanson's new book looks at the evolutionary significance of feathers in birds. Hanson tells Fresh Air that he's amazed by birds' magnitude of feathers, how feathers grow and how they're the "most efficient insulation known."

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Thor Hanson

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Thor Hanson

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Conservation Biologist Explains Why 'Feathers' Matter

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