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Birds characteristics In four line

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Birds characteristics In four line
  • 1 answers

Yogita Ingle 4 years, 1 month ago

  • Feathers are the defining characteristic of Aves, found on every living species of bird and no other class of animal. Feathers are made of keratin, the same substance that forms hair and nails in other animals and are highly modified scales.
  • All birds have wings, although not all birds fly. 
  • All birds have beaks, or bills, made of a bony core surrounded by a thin layer of keratin.
  • Most birds have lightweight skeletons with hollow bones.
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