BIRD

BIRD



The five most well-known classes of vertebrates (animals with backbones) are mammals, birds, fish, reptiles, amphibians. They are all part of the phylum Chordata
 -- I remember "Chordata" by thinking of spinal chord.
Birds are neither mammals (they don't have mammary glands) nor reptiles (they are not cold blooded), but instead belong in a grouping all their own. The bird group is one of six basic animal groups animal groups, with the others being amphibians, fish, invertebrates, mammals, and reptiles.

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