http://en.wikipedia.org/wiki/Mammal
According to Mammal Species of the World, 5,416 species were known in 2006. These were grouped in 1,229 genera, 153 families and 29 orders. In 2008 the IUCN completed a five-year, 1,700-scientist Global Mammal Assessment for its IUCN Red List, which counted 5,488 accepted species at the end of that period.In some classifications, the mammals are divided into two subclasses (not counting fossils): the Prototheria(order of Monotremata) and the Theria, the latter composed of the infraclasses Metatheria and Eutheria. Themarsupials constitute the crown group of the Metatheria and therefore include all living metatherians as well as many extinct ones; the placentals likewise constitute the crown group of the Eutheria.
According to Mammal Species of the World, 5,416 species were known in 2006. These were grouped in 1,229 genera, 153 families and 29 orders. In 2008 the IUCN completed a five-year, 1,700-scientist Global Mammal Assessment for its IUCN Red List, which counted 5,488 accepted species at the end of that period.In some classifications, the mammals are divided into two subclasses (not counting fossils): the Prototheria(order of Monotremata) and the Theria, the latter composed of the infraclasses Metatheria and Eutheria. Themarsupials constitute the crown group of the Metatheria and therefore include all living metatherians as well as many extinct ones; the placentals likewise constitute the crown group of the Eutheria.
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