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Temporal range: Upper Triassic–Recent
|Raccoon (Procyon lotor )|
|Subclasses & Infraclasses|
Mammals are the group of vertebrate animals which form the class Mammalia. Humans, and some of the most familiar animals, such as dogs, cats, or horses, belong to this group. They can be recognised by their hair : all animals with a fur are mammals, even if not all mammals have a hairy skin : the dolphin's skin, for example, is nude, while the pangolins are totally covered with hard scales...
All mammals share a unique feature : female mammals, when having a baby, produce milk to feed him. Milk is produced in the mammary gland, which means that all mammals have mammary glands.
Most of (but not all) mammals give birth to living young, but some of them, like the strange platypus, lay eggs.
Mammals have fur and a very precise kind of temperature regulation. The females bear live young, and produce milk for the young. Parental care of the young is universal among mammals, and it is essential because live birth limits the number of offspring.