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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).

The mammals represent the only living Synapsida, which together with the Sauropsida form the Amniota clade.In some classifications, extant mammals are divided into two subclasses: the Prototheria, that is, the order Monotremata; and the Theria, or the infraclasses Metatheria and Eutheria.The marsupials constitute the crown group of the Metatheria, and include all living metatherians as well as many extinct ones; the placentals are the crown group of the Eutheria.With the exception of the five species of monotreme (egg-laying mammals), all modern mammals give birth to live young.Most mammals, including the six most species-rich orders, belong to the placental group.

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No classification system is universally accepted; Mc Kenna & Bell (1997) and Wilson & Reader (2005) provide useful recent compendiums.

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