Amphibians are animals with back-bones and 4 legs. They have soft, moist skin. They are cold-blooded. This means they can't make their own heat to keep warm, like birds and mammals can. An amphibian's body is the same temperature as the ground or water where it is.

Amphibians lay eggs that have no shells, but are covered by jelly. Their eggs are laid in water, and the young live and feed in the water. Young amphibians breathe underwater using gills like fish.

When the young have grown large enough they change to the adult shape and grow lungs to breathe air. Then they live on land. Most amphibians live like this, but some kinds spend all their lives living in water.

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