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Bill Nye the Science Guy - Season 3 Episode 18

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Scientists believe that birds evolved from reptiles. Birds have backbones, and they lay eggs, but they’ve developed a unique feature that sets them apart from all other animals – feathers. Feathers are made of the same stuff human fingernails and hair are made from – a protein called keratin. Feathers, combined with lightweight bones, powerful wings and strong hearts let birds fly.

スタジオ:

初放送日: Sep 10, 1993

最終放送日: Jun 20, 1998

エピソード: 100 エピソード

シーズン: 5 シーズン

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