Why Birds First Grew Feathers
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When birds first grew feathers 150 million years ago, their function was not necessarily to help with flight.
From: DAVID ATTENBOROUGH'S CONQUEST OF THE SKIES: Rivals
http://bit.ly/1YjydHc
From: DAVID ATTENBOROUGH'S CONQUEST OF THE SKIES: Rivals
http://bit.ly/1YjydHc
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