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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...
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.