Mammals that sustain their young in their pouch are known as Marsupials. Examples of marsupials include Kangaroo, wallabies, koalas, Tasmanian devils, wombats, and opossum. Marsupials are most common in the Southern Hemisphere notably Australia and South America. Marsupials are a group do mammals that have an external pouch found on their abdomen in which they carry their young.
Their babies are blind at birth, and they have no ears and hardly any back legs. They have strong front legs and a good sense of smell. With these two assets, the young baby crawls from the mother's birth canal and into the pouch and attaches to one of her teats and stays there for many months until it grows into a viable young mammal.
Baby kangaroo’s, also known as a joey, are born measuring only a small one inch long. Joeys are born at an early stage of development and will crawl into their mothers pouch and attach to the mothers teat to feed, where they will then spend most of their time growing and developing.
The joey will stay in the mothers pouch for approximately 9 months where it will then begin to leave the pouch for small periods of time. Once kangaroos reach their full growth, they can measure up to a large 6 feet 7 inches and can weigh up to 200 pounds.