Frogs, toads, newts and salamanders are amphibians which survive today. There are also some other unusual types of amphibian, such as blind cave-dwellers. All modern amphibians produce aquatic tadpoles from their eggs, which are laid in water or kept moist by special body modifications. It is thought that their ancestors reproduced in the same way.
Amphibians such as frogs and toads are valuable because they eat huge amounts of damaging insect pests, but their numbers have been drastically reduced in recent years. They are sometimes used for food, and they are also susceptible to the many insecticides used by farmers.
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