概念图导读：动物类别

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A mammal is an animal with hair that gives birth to live babies.

A reptile is an animal that lives on land and has dry skin.

Any animal that can live both on land and in water is an amphibian. Amphibians have smooth,wet skin.

A bird has feathers and two wings.Most bird can fly.

An insect is a small creature with three body parts,and six legs.Insects have no bones.

A fish is a creature that lives in water and breathes through gills.Fish use fins and a tail to swim.