Class Amphibia (Greek, amphibios = living in double life).  The members of this class are frogs, toads, salamanders, newts and caecilians (legless amphibian).

Amphibians were the first vertebrates that colonized the land.  These animals are terrestrial that begin life in water.  These animals are most abundant in damp habitats.  They are air breathers and presence of a thin slimy skin is a common feature among amphibians that is used for gas exchange.

Most adult amphibians are carnivorous, feeding on insects, snails, worms, and other small animals.  Some amphibians such as frogs and toads have evolved several defense mechanisms, such as poison glands on the skin, being able to camouflage, and leaping.