Kangaroos are mammals that are part of a special group known as Marsupials. Marsupials are mammals that have special pouches used for carrying their babies. A kangaroo gives birth to a live undeveloped foetus called a joey. When the joey is born, it crawls from inside the mother to the pouch. The pouch is a fold of skin with a single opening that covers the nipples. The mother’s pouch provides a safe place for the joey to stay until it grows. The joey will usually stay in the pouch for about nine months.