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The characteristics that qualify birds are:

  • warm blooded (endothermic)
  • vertebrates (they have a backbone and an internal skeleton)
  • breathe using lungs (not gills)
  • an outer covering of feathers - this feature is not shared with any other vertebrate group
  • reproduce by laying eggs

Other features which are characteristics of birds, but not used to set them apart from other vertebrate groups, include:

  • All birds have wings, but not all birds fly: generally, there is reduction of skeletal weight
  • Birds have beaks or bills, and do not have teeth
  • Birds have two legs
  • Birds have a cloaca, a cavity into which the intestinal, urinary, and genital canals empty
  • Birds have nucleated red blood cells, unlike mammals
  • Birds have a chambered heart

have 2 wings feathers beak and lay eggs
The characteristics that qualify birds are:

warm blooded (endothermic)

vertebrates

breathe using lungs (not gills)

reproduce by laying eggs

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9y ago

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