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Findings from molecular genetics, for example, have prompted adopting new groups, such as the Afrotheria, and abandoning traditional groups, such as the Insectivora.The mammals represent the only living Synapsida, which together with the Sauropsida form the Amniota clade.

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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.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.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.

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