High-altitude birds evolved thicker 'jackets' Post a Comment Himalayan songbirds in colder, more elevated environments have feathers with more fluffy down. Baca JugaIn pictures: Solar eclipse as seen from the UK'Miraculous' mosquito hack cuts dengue by 77%Backlash against 'frightening' tests on whales Read More Share : Post a Comment for "High-altitude birds evolved thicker 'jackets'"
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