Mammals are classified in Monotremes (Ornithorhychus (Platypus), Tachyglossidae (Echidna)) and Theriiformes (Triconodonts, Multituberculates, Marsupials, and Placentals. According to Mammal Species of the World, 5,702 species were known in 2005. These were grouped in 1,229 genera, 153 families and 29 orders.
The word "mammal" is modern, from the scientific name Mammalia coined by Carl Linnaeus in 1758, derived from the Latin mamma ("teat, pap"). All female mammals nurse their young with milk, which is secreted from special glands, the mammary glands.
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