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History of Frogs

ere laid sometimes dries up. As a result, the tadpoles die. Certain tropical frogs lay their eggs in rain water that collects among the leaves of plants or in holes in trees. Other tropical species attach their eggs to the underside of leaves that grow over water. When the eggs hatch, the tadpoles fall into the water. Among some species, one of the parents carries the eggs until they hatch. For example, the female of certain South American tree frogs carries the eggs on her back. Among another species of frog, the midwife toad, the male carries the eggs wound around his hind legs. Males of another species, Darwin's frog, carry the eggs in their vocal pouch. Some tropical frogs lay their eggs on land. They lay them under logs or dead leaves. These frogs have no tadpole stage. A young frog hatches from the egg and begins life as a land animal. Tadpoles are not completely developed when they hatch. At first, the tadpole clings to some support in the water, using its mouth or a tiny sucker. A tadpole has no neck, and so its head and body look like one round form. The animal has a long tail and resembles a little fish. It breathes by means of gills, which are hidden by a covering of skin. A tadpole's form changes as the animal grows. The tail becomes larger and makes it possible for the animal to swim about to obtain food. Tadpoles eat plants and decaying animal matter. Some tadpoles eat frog eggs and other tadpoles. In time, the tadpole begins to grow legs. The hind legs appear first. Then the lungs begin to develop and the front legs appear. The digestive system changes, enabling the frog that develops to eat live animals. Just before its change into a frog, the tadpole loses its gills. Finally, a tiny frog, still bearing a stump of a tail, comes up from the water. Eventually, the animal absorbs its tail and assumes its adult form. After a frog becomes an adult, it may take a few months to a few years before the animal is mature enough to ...

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