a type of animal (such as a kangaroo or koala) that carries its babies in a pocket of skin on the mother's stomach
Kangaroos, koalas, and wombats are all marsupials native to Australia.
A marsupial's young are born at a very early stage and continue developing in the pouch.
From the textHowever, these small creatures are not a species of bear, but rather a type of mammal called a marsupial, and have stomach pockets in which mothers carry their young.