Section 3

Reproduction in Amphibians

• Male frogs call to attract females of the same species.

• The male frog grasps the female in an embrace called amplexus and fertilizes her eggs as they are released.

• A life cycle is the stages through which an organism passes from fertilization to reproductive maturity. Most amphibians lay their eggs in water, and have an aquatic larval stage and a terrestrial adult stage.

Vocabulary amplexus (p. 810)

• The hormone thyroxine triggers metamorphosis. During metamorphosis, the tadpole loses its tail and gills and grows legs and lungs.

• Many amphibians show parental care by guarding their eggs and keeping their eggs moist. Some take their eggs into their body to develop.

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