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In human culture, domesticated mammals played a major role in the Neolithic revolution, causing farming to replace hunting and gathering, and leading to a major restructuring of human societies with the first civilizations.

They provided, and continue to provide, power for transport and agriculture, as well as various commodities such as meat, dairy products, wool, and leather.

Defaunation of mammals is primarily driven by anthropogenic factors, such as poaching and habitat destruction, though there are efforts to combat this.

Mammal classification has been through several iterations since Carl Linnaeus initially defined the class.

Mammals include the biggest animals on the planet, the great whales.

The basic body type is a terrestrial quadruped, but some mammals are adapted for life at sea, in the air, in trees, underground or on two legs.

The largest group of mammals, the placentals, have a placenta, which enables the feeding of the fetus during gestation.

Most mammals, including the six most species-rich orders, belong to the placental group.

Some mammals are intelligent, with some possessing large brains, self-awareness and tool use.