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Bill Nye the Science Guy
1993
Published on, 1 month ago
Bill Nye the Science Guy
Birds 3 Season 18 Episode
26 min
1993
7.3
Scientists believe that birds evolved from reptiles. Birds have backbones, and they lay eggs, but theyโve developed a unique feature that sets them apart from all other animals โ feathers. Feathers are made of the same stuff human fingernails and hair are made from โ a protein called keratin. Feathers, combined with lightweight bones, powerful wings and strong hearts let birds fly.
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