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.
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Bill Nye: The Science Guy - 3x18 Birds
- Poor
- Nothing special
- Worth watching
- Pretty cool
- Awesome
- Aired Oct 13, 1995
- Episode 3x18
- Show special No
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