When a tadpole hatches from its egg, it looks like a small fish. The tadpole grows larger and eventually develops the physical characteristics of the mature animal. The process of changing from a larva to an adult is called metamorphosis. The tadpole stage may last from 10 days to more than 2 years, depending on the species of frog or toad. Newly hatched tadpole Tadpoles live in shallow waters wherever frogs and toads are found.
Most tadpoles inhabit ponds, lakes, or slow-moving rivers.
The greatest variety of tadpoles live in the tropics. Most tadpoles hatch from a jellylike mass of eggs laid in the water. A tadpole has a large, rounded head and a long, flat tail. It uses the tail to propel itself through the water. Tadpoles breathe by means of gills.