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Monotremes are extraordinary mammals which lay eggs, rather than giving birth to live young. All other mammals give live birth. The only known monotremes are the platypus and the echidna, both of which are found in Australia, while echidnas are also found in New Guinea. They are mammals because, like all mammals, they suckle their young on mothers' milk. They also share all other features of mammals, such as being warm-blooded vertebrates with fur that breathe using lungs, and have a four-chambered heart.

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12y ago

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