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Mammals (formally Mammalia) are a class of vertebrate, air-breathing animals whose females are characterized by the possession of mammary glands while both males and females are characterized by sweat glands, hair and/or fur, three middle ear bones used in hearing, and a neocortex region in the brain.


Types of Mammals

Mammals are basically charaterized into nine groups, here is the list of all its varieties:




Hoofed Mammals

Marine Mammals

Pouched Mammals



Rodents and Moles

Ten Facts about Mammals

  1. Most mammals are covered with hair or fur, and most have specialized teeth that help them to cut or chew their food.
  2. The most successful mammals in this environment are ruminants-hoofed species such as buffaloes and antelopes, which have a highly specialized digestive system that has evolved to break down cellulose, a tough substance that forms the walls of plant cells.
  3. Placental mammals are one of three major groups of living mammals.
  4. Mammals themselves are part of a larger tetrapod group called the Synapsida.
  5. Mammal is an animal that feeds its young on the mother's milk.
  6. Mammals are important not only to people but also to the whole system of life on the earth.
  7. Mammals that eat flesh, which is easy to digest, have a fairly simple stomach and short intestines.
  8. Phylogenetically, the Mammalia are defined as the last common ancestor of monotremes (e.g., echidnas) and therian mammals (e.g., hedgehogs), and all of this last common ancestor's descendants.
  9. Mammals have integumentary systems made up of three layers: the outermost epidermis, the dermis, and the hypodermis.
  10. No other animal has hair in the same form as mammals, and all mammals have some hair at least at the beginning of their lives - baby whales and dolphins are born with a moustache.

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