Members of the infraclass Metatheria of the class Mammalia. The young are born at a relatively less developed stage than those of placental mammals; after birth, the young animal attaches to a mammary gland in the pouch, where it continues to grow and develop.

Mammals that give birth to young at a very immature stage, e.g. kangaroos. While many marsupials have pouches, not all do.

Any of an order (Marsupialia) of mammals comprising kangaroos, wombats, bandicoots, opossums, and related animals that usually have a pouch on the abdomen of the female which covers the teats and serves to carry the young.

the mammals whose embryos develop within the mother's uterus for a short period of time before birth.

The group of mammals whose young are born very undeveloped and must attach themselves after birth to the mother's milk glands, where they are usually protected by a pouch. Australia is known for its wide variety of marsupials, such as kangaroos, wombats, and bandicoots. The opossum, found in North and South America, is also a marsupial. Marsupials are known in Europe, Asia, and Africa only through ancient fossils.

Pouched mammals. The young develop internally, but are born while in an embryonic state and remain in a pouch on the mother's abdomen until development is complete; this group includes kangaroos, koalas, and opossums. One of the three reproductive "strategies" of living mammals g-laying and placental being the other two), marsupials finish development in a pouch or under hairy coverings attached to the mother.

An order of Mammalia in which the young are born in a very incomplete state of development, and carried by the mother, while sucking, in a ventral pouch (marsupium), such as the Kangaroos, Opossums, &c. (see MAMMALIA). 119

mammals for which the placenta is very short-lived and does not make as much of a contribution to fetal nourishment as it does in placental mammals; placental development is very limited; the young is born 10–12 days after the breaking of the egg, crawls into the motherâ€(tm)s pouch, and attaches itself to the teat