There are technically three distinct groups of mammals. The placental mammals, the marsupials, and the monotremes. The primary difference is the nature of reproduction. Placental mammals give birth to live young. The marsupials do the same, but the young are more mature and are placed within pouches. The Monotremes actually lay eggs. Placentals are the most common world wide. The Marsupials are mostly relegated to Australia, and the same goes for Monotremes which are the rarest of the groups with just a few examples remaining. Placental mammals are the modern mammals. While Monotremes, and Marsupials are vestigial holdovers from earlier epochs.
I am seriouslyshocked that some of you did not know this. I learned this in sixth grade science class. Yeah and its most mammals give birth to live young, and not all creatures that give birth to live young are mammals.
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