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ALL ABOUT MAMMALS!
Geologic Time Chart
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All About MammalsWhat Is a Mammal?
Types of Mammals
Monotremes: The monotremes are primitive egg-laying mammals. Modern-day monotremes include the echidnas (spiny ant-eaters) and the duck-billed platypus.
Marsupials: Marsupials are another group of mammals; their young are born in an extremely immature state; most female marsupials have pouches. Some marsupials include the koala, kangaroo, and the numbat.
Placental mammals: Placental mammals are mammals whose young are born at a relatively advanced stage (more advanced than the young of other mammals, the monotremes and marsupials). Before birth, the young are nourished through a placenta. The placenta is a specialized embryonic organ that is attached the mother's uterus and delivers oxygen and nutrients to the young. Most mammals are placental mammals, like cats, dogs, horses, and people.
Mammals have to eat a lot to maintain their high body temperature. Diets vary from genus to genus. As with most animal groups, there are more herbivores (plant-eaters) than there are carnivores (meat-eaters).
Types of Mammalian Diets:
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