This document defines and provides characteristics of different types of animals including mammals, birds, reptiles, amphibians, fish, and insects. Mammals have hair, give birth to live young, and feed their babies milk. Birds lay eggs, have feathers and wings, and can fly. Reptiles lay eggs, have scales, and may have no legs or four legs. Amphibians have wet skin, live both on land and in water, and lay eggs in water. Fish lay eggs, live only in water, breathe with gills, and swim with fins. Insects have six legs, lay eggs, and have segmented bodies with a head, thorax, and abdomen.