The young are nourished in a placenta before birth. In this lesson, we'll learn about some of the characteristics of placental mammals and go over some examples.
They are also some of the most familiar organisms to us, including pets such as dogs and cats, as well as many farm and work animals, such as sheep, cattle, and horses. There are no epipubic bones.
3. Except for the monotremes (an egg-laying order of mammals comprising echidnas and the duck-billed platypus), all mammals are viviparous—they bear live young. Placental mammals are a rather diverse group, with nearly 4000 described species, mostly rodents and bats (photos at left).
The placental mammals include such diverse forms as whales, elephants, shrews, and armadillos. Placental mammals are a specialized type of mammal. Some common characteristics unique to placental mammals are: 1. Placental mammal, (infraclass Eutheria), any member of the mammalian group characterized by the presence of a placenta, which facilitates exchange of nutrients and wastes between the blood of the mother and that of the fetus.
2.
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