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Birds

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Birds
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Meghna Thapar 4 years, 4 months ago

Birds are a group of warm-blooded vertebrates constituting the class Aves, characterized by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. They can fly.

7 Characteristics of birds

  • Feathers.
  • Wings.
  • lightweight, rigid skeleton.
  • Endothermic metabolism.
  • unique respiratory system.
  • beak.
  • oviparity.
http://mycbseguide.com/examin8/

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