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Most mammals do not lay eggs at all, but give birth to live young.

The only mammals which lay eggs - the platypus and the echidna - are known as monotremes. The platypus lays its eggs on land, in a chamber at the end of a long burrow it digs in the riverbank or creek bank. The echidna actually develops a rudimentary pouch into which it lays a single egg during breeding season.

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12y ago

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