A mammal is a vertebrate animal of the class Mammalia. Mammals are characterized by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle ear bones. These characteristics distinguish them from reptiles and birds, from which their ancestors diverged in the Carboniferous period over 300 million years ago. Around 6,640 extant species of mammals have been described and divided into 27 orders. The study of mammals is called mammalogy.
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6,467 species Catalogue of Life COL26.10 · CC BY
Shares counted over species below this taxon. Tree of Life v3d, counted live
Not assessed by the IUCN Red List (or no assessment linked via Wikidata).
No openly licensed photos are linked to this taxon yet.
Dataset v3d. Classification: Catalogue of Life COL26.10 (CC BY 4.0) and Open Tree of Life (CC0). Each photo is credited where it is shown.