But koalas and kangaroos are not the same animals. Koalas, also known as koalas, are Australia's national treasures and unique marsupials. Koalas are born as small as beans. They will move into their mother's bag and complete their development there. Kangaroos are also unique animals in Australia, but they don't develop in their mothers' bags like koalas, but climb into their mothers' hinterland immediately after birth and rely on their mothers' mammary glands to feed them.