The document discusses different types of animals. It describes how vertebrates have backbones and invertebrates do not. It lists insects, fish, reptiles, amphibians, birds, and mammals as categories of animals and provides some examples of animals that fall into each category such as butterflies, salmon, snakes, frogs, eagles, lions, and bats. The document also notes some distinguishing features of these animal groups such as insects having legs, fish breathing through gills, reptiles having scales, and mammals having hair or fur.