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Mammals are broken into 3 reproductive categories: Monotremes, Marsupials, and placental mammals.
Monotremes lay eggs. They include the duck-billed platypus and the echidna (spiny anteater).
Marsupials give birth to young that are not fully developed, and must stay in a pouch where they are given milk and finish development there. These include kangaroos, opossums, and koalas.
Plactenal mammals remain inside the mother's body during development, using the placenta as a source for nourishment and waste removal. These include all other mammals, including humans.
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