Native people first arrived in Australia around 1770. Later, convicts were sent from England and Ireland to Australia as punishment. Some key facts about Australian animals include that kangaroos and emus cannot walk backwards, male kangaroos can leap over 9 meters, and the smallest is the musky rat-kangaroo. Hardiness was needed for the tough pioneer lifestyle in Australia. Sydney opera house is a famous landmark. Wombats leave square-shaped dung to help them find their way home through smell.