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.
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.
A fish is not a mammal. Mammals are animals that are warm-blooded, breathe air, possess hair and give birth to live young that they feed milk from mammary glands. Fish are cold-blooded, extract oxygen from water, have scales and lay eggs.
Birds are not mammals. They don't have fur, and they don't nurse their young with milk as mammals do; however, birds share some traits with mammals. They are warm blooded and can eat a wide variety of food, from fruits and seeds to reptiles, fish, small mammals and othe...
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.
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.