The document discusses the characteristics of mammals and birds. Mammals are vertebrates that have hair, give live birth, drink mother's milk, and breathe with lungs. Most mammals have four legs. Examples of mammals mentioned include cows, monkeys, bats, zebras, lions, and cats. Birds are also vertebrates that have feathers, wings to fly with, and lay eggs. Examples given are flamingos, ducks, eagles, hens, chickens, parrots, doves, and cocks.