Aborigines did not come to Australia by way of “land bridge” between Asia and Australia. If such a “land bridge” had existed all kinds of placental mammals would have come to. As it is, the only placental mammals who inhabited the smallest continent in 1788 were Aborigines, dingos (which had come as hunting dogs), and bats (which had flown here). The Aborigines came here in bark canoes with their dogs, traversing the Indonesia archipeligo.