Frogs lay eggs in water, and the eggs hatch into tadpoles that grow into frogs.All frogs reproduce sexually, and all hatch from eggs.In almost all frogs, egg fertilization happens outside the female's body instead of inside. The female releases her eggs and the male releases his sperm at the same time. Most frogs need to lay their eggs in water. Each female lays thousands of eggs at a time, in slimy masses. The eggs hatch into tadpoles, which look very different from frogs. The tadpoles live exclusively in the water and breathe through gills instead of lungs like an adult frog. The tadpoles have a tail for swimming instead of legs and arms for hopping. Tadpoles have also a small rasping mouth for scraping algae off the bottom of the pond instead of the wide mouth and strong jaws suited to the adult frog's carnivorous diet. Some kinds of frogs have different ways to raise their families. In some species, the eggs hatch directly into little froglets and there is no tadpole stage at all. One kind of treefrog builds hanging nests; the tadpoles drop into water below as they hatch.
