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Mammals have characteristics in their cells and bodies that help classify them as mammals. All mammals are vertebrates, are endothermic, have hair on their bodies and produce milk in order to feed their young.


Mammals, including humans, belong to the Mammalian class, which is the highest order of vertebrates. Mammals have a backbone, grow hair, produce milk for the nourishment of their young via mammary glands and are warm-blooded, or endothermic.


Mammals play a vital role for the ecosystem in which they live. Mammals are important for maintaining services and functions associated with sustaining a balanced ecosystem. Various mammals are used as a food and clothing resource. They are also important for different recreational purposes.


Mammals live in almost every habitat on Earth. This includes habitats in polar regions, oceans and tropical forests. The survival of mammals in almost all environments is largely a result of their various adaptations.


As of 2015, there are about 5,000 known kinds or species of mammals. Mammals as a group are divided into three main kinds: placental mammals, marsupials, and monotremes,


The food eaten by mammals varies based on the type of mammal, the season and the environment. Mammals can be classified as carnivores, herbivores and omnivores. Carnivores primarily eat meat, herbivores primarily eat plants and omnivores eat both.


The three types of mammals are the marsupials, the monotremes and the placental mammals. These groups are defined by the way in which their babies develop.


Mammals move by using contractile muscles that pull against attachment points in their rigid internal skeletons, causing the bones to change orientation relative to each other around specific joints. This muscle contraction directly affects the movement, as the muscle pulls in a linear fashion in th


Humans are classified as mammals. Like other mammals, humans have body hair, suckle their young with milk produced from special glands on their chests, possess differentiated teeth and a four-chambered heart, and become pregnant rather than lay eggs.


Dogs are mammals. They are warm-blooded, which means they generate the heat of their own bodies. They have fur, and mother dogs feed their young with milk produced by their bodies.