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Viviparous animals are those which give birth to live young that have been nourished by the mother's body. This includes all mammals except the egg-laying monotremes (the platypus and echidnas). We humans are an example of a viviparous animal.

Oviparous animals are those which lay eggs, such as birds. All birds are oviparous - pick any one you like as an example.

There are also animals termed ovoviviparous. These animals retain their eggs inside their bodies until they hatch, when the young are expelled alive. Boas and pit vipers such as rattlesnakes are examples of this.

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