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What an Owl Knows: The New Science of the World's Most Enigmatic Birds, by Jennifer Ackerman

Collectively, the serrated edge, the pennula, and the wispy tips unite each of the feathers into a single soft surface without sharp, noisy edges.

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What an Owl Knows: The New Science of the World's Most Enigmatic Birds

What an Owl Knows: The New Science of the World's Most Enigmatic Birds

by Jennifer Ackerman

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