Australian aborigines settled in the Australian mainland more than 40 thousand years ago. They are completely isolated from the world and live by hunting and gathering. In the eighteenth century, Europeans came here and forced the indigenous people to leave their territory. Many aborigines feel isolated in the white society, but they still try to maintain the individuality of their tribe. Australian aborigines are the earliest inhabitants of Australia. They belong to nomadic people and have no fixed settlements. They are scattered all over Australia. Before Europeans occupied Australia, there were more than 500 tribes with a population of 750,000.