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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.
The modern mammalian orders arose in the Paleogene and Neogene periods of the Cenozoic era, after the extinction of non-avian dinosaurs, and have been among the dominant terrestrial animal groups from 66 million years ago to the present.
The largest orders are the rodents, bats and Soricomorpha (shrews and allies).
The next three biggest orders, depending on the biological classification scheme used, are the Primates (apes and monkeys), the Cetartiodactyla (whales and even-toed ungulates), and the Carnivora (cats, dogs, seals, and allies).
Living mammals are divided into the Yinotheria (platypus and echidnas) and Theriiformes (all other mammals).
There are around 5450 species of mammal, depending on which authority is cited.