High-altitude birds evolved thicker 'jackets

Himalayan songbirds in colder, more elevated environments have feathers with more fluffy down.

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Himalayan songbirds evolved thicker down, #birds #birding

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The birds in colder, more elevated environments had feathers with

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The Himalayas - BBC News

ヒマラヤ山脈の小鳥：平地の小鳥と どこが違う？ (BBC-Science, Feb 15

High-altitude birds evolved thicker 'jackets' - BirdNerd