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All groups of animals lay eggs. The one most commonly defined as non-egg-laying is the group known as mammals. Almost all mammals give birth to live young. The exception to this are the three species of monotremes, or egg-laying mammals, and they include the platypus and the two species of echidnas.

Within the other vertebrate groups, only the "Birds" are all egg-layers. There are some species of fish, reptile and amphibians which do not lay eggs.

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Eloise Upton

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3y ago

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