There are many different types of mammals. Humans are mammals. There are 4,000 different types of mammals. The bull elephant, which is also a mammal, is the largest animal living on land. Mammals are one of the six main classes of animals. Mammals are vertebrates, which means that they all have backbones (spines). Most animals don't have backbones and that makes mammals one of the few groups that have a spine.
Did you know that there are certain classifications to be a mammal? First, they all must have glands that give out milk and this gland is so they can give their baby milk. All mammals have fur or hair and are warm-blooded. Most mammals also have teeth with the exception of some mammals. Mammals can live on land, in the sky, and underwater. They also live in warm and cold temperatures. Dolphins and whales also have hair, you just need a magnifying glass to be able to see it.
Mammals have a wider distribution and are more adaptable than any other single class of animals. Humans have depended on other mammals for food and clothing. Domestication of mammals helped to provide a source of protein for ever-increasing human populations and provided means of transportation and heavy work. Other mammals also provide tools for laboratory subjects for the study of human-related physiology, psychology, and a variety of diseases from dental cavities to cancer.