Mammals

Mammals are a class of vertebrate animals characterized by the presence of mammary glands that produce milk for their offspring, and by the presence of hair or fur on their bodies. They are warm-blooded, meaning they can regulate their own body temperature, and have a four-chambered heart. Mammals are found in almost every part of the world, and range in size from the tiny bumblebee bat to the massive blue whale. They can live in a variety of environments, from the icy tundra to the hot and humid jungle. Some examples of common mammals include dogs, cats, whales, elephants, and humans. Mammals have adapted to their environments in many ways, and have evolved unique characteristics such as echolocation, hibernation, and the ability to fly. Despite their diversity, all mammals share common traits that distinguish them from other animals.