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Why is the platypus so unusual?

Platypus swimmingThe platypus belongs to a small group of mammals known as monotremes. They are the only mammals that lay eggs instead of giving birth to live young, as marsupials and placentals (all other mammals) do. There are only five kinds of monotremes: four species of echidna and the platypus. They live only in Australia and New Guinea.


The platypus and echidnas are the only mammals that lay eggs.

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