Explaining feathers were 'invented' mostly to thermoregulate (oh yeah & secondly, fly) @AMNH #Dinosaur #AMNHtweetup

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Explaining feathers were 'invented' mostly to thermoregulate (oh yeah & secondly, fly) @AMNH #Dinosaur #AMNHtweetup

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Explaining feathers were 'invented' mostly to thermoregulate (oh yeah & secondly, fly) @AMNH #Dinosaur #AMNHtweetup http://yfrog.com/h645116033j

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