Bill Nye The Science Guy - S03E18 - Birds - Best Quality

Bill Nye The Science Guy - S03E18 - Birds - Best Quality Teachers/Educators, email me for fully quality episodes (Youtube has compression) Email: [email protected] Episode Description: 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.