Amphibians lay their eggs in water, and young amphibians tend to resemble
small fish. The tadpole, or newborn frog, is born and lives in water. It
has a tail that allows it to swim like a fish. It also has gills so that
it can breathe under water. As the tadpole grow into a frog, it loses its
gills and tail, and develops legs for moving on land. Most amphibians can
both walk and swim in water.
Depending on the species of amphibian, breathing can take place in
gills, lungs, the lining of the mouth, the skin, or some combination of
these.
Amphibians body temperature changes with its environment. In cold climates,
amphibians hibernate during the winter.