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Season 5 Episode
- Season 3 Planets & Moons
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- Season 3 Animal Locomotion
Bill Nye the Science Guy - Season 3 Episode 18 Birds
7.21 26 minutes 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.
