This document describes the characteristics of amphibians. Amphibians are vertebrates that lay many eggs in water and are oviparous. They breathe through lungs on land and through their skin in water, though babies have gills. They have 4 legs or no legs, moist smooth skin, and webbed feet. Amphibians are cold-blooded and live both on land and in water. Examples mentioned are frogs, newts, toads, and salamanders.