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All mammals share several common characteristics.

Explore how mammalian evolutionary adaptations allowed them to surpass dinosaurs as dominant terrestrial vertebrates. Learn about common characteristics and anatomical features shared by all mammals, their diverse groups including Monotremes, Marsupials, and Eutherians.

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All mammals share several common characteristics.

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  1. KEY CONCEPT Evolutionary adaptations allowed mammals to succeed dinosaurs as a dominant terrestrial vertebrate.

  2. All mammals share several common characteristics. • Mammals are active, large-brained, endotherms with complex social, feeding, and reproductive behaviors.

  3. All mammals share four anatomical characteristics. • hair to retain heat • mammary glands to produce milk

  4. All mammals share four anatomical characteristics. • a middle ear with three bones to hear higher-pitched sounds • chewing jaw to break up food quicker

  5. A set of adaptations in the mammalian jaw makes chewing possible. • secondary palate closes off air passages • muscles move jaw side-to-side

  6. Modern mammals are divided into three main groups. • Monotremes lay eggs. • duck-billed platypus • echidna

  7. Marsupials give birth to live young that grow to maturity inside a pouch. • opossum • kangaroo • wombat • koala

  8. Eutherians give birth to live young that have completed fetal development. • most familiar mammals • humans • Eutherians filled many niches after the extinction of the dinosaurs.

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