Mammal
Class of animals with milk-producing glands
Why this is trending
Interest in “Mammal” spiked on Wikipedia on 2026-02-26.
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Key Takeaways
- A mammal is a vertebrate animal of the class Mammalia .
- These characteristics distinguish them from reptiles and birds, from which their ancestors diverged in the Carboniferous Period over 300 million years ago.
- The study of mammals is called mammalogy.
A mammal is a vertebrate animal of the class Mammalia. Mammals are characterised 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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