A kangaroo’s specialized pouch is called a pouch, where its young continue developing after birth.
Kangaroos are marsupials, so their newborns are extremely small and comparatively undeveloped. Shortly after birth, a newborn kangaroo crawls into the mother’s pouch and attaches to a teat. It remains there while its limbs, organs and fur mature.
The pouch is not simply a permanent pocket. Its lining and condition change during reproduction, and the mother can produce milk with different compositions for young at different developmental stages. In some species, a mother may support young at several stages simultaneously: one outside but still suckling, one in the pouch and another developing as an embryo.
Kangaroos are native to Australia and nearby islands. The term kangaroo commonly refers especially to the larger members of the family Macropodidae, while smaller relatives are often called wallabies or wallaroos.