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Mammals are a class of vertebrates. They are distinguished by producing milk to nourish their young; their name comes from the name mamma (plural mammae) for the glands that produce the milk.

All mammals are warm-blooded and covered with hair, though the hair is very sparse on some species such as dolphins. Nearly all mammals give birth to live offspring rather than laying eggs.

The animals that are classified as mammals are dogs, cats, fish, birds, and much more.

Classification of living mammals[edit]

  • Subclass Prototheria