Marsupials are a group of mammals characterized by having a pouch called a marsupium, in which they carry and protect their young in early stages of development. They are known for animals such as kangaroos, koalas, and opossums.
Unlike placental mammals, marsupials have extremely small offspring at birth, and these complete their development inside the mother’s marsupium, where they feed and receive protection until they are sufficiently developed to emerge.
Marsupials are primarily found in Australia, New Guinea, and South America.