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Monotremes- spiny anteater and duck- billed platypus. Native to Australia, they lay hard eggs and feed from their mother's milk. They are the least evolved and have some traits of reptiles. Marsupials- Koala bears, kangaroos, tazmanian devils and wallabys. They are born premature and nursed in a pouch. All marsupials except opsssum are from Australia. Placentals- Are all the rest of the mammals in the world, their offspring develop on the inside of the mother.

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