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What are the characteristics of birds?

In: Birds [Edit categories]

Answers.com > Wiki Answers > Categories > Animal Life > Vertebrates > Birds > What are the characteristics of birds?
Answer:
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
First answer by ID1364632970. Last edit by On the Wallaby. Contributor trust: 2481 [recommend contributorrecommended]. Question popularity: 50 [recommend question].

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