Kangaroo
Kangaroos range in size from small to large, and there is a type kangaroo for just about every environment in Australia. They are famous for their marsupial pouch and their method of locomotion which is to jump about on their large hind feet.
Wallabies are smaller, though their different diets indicate different teeth.
Kangaroos are often seen laying around and scratching themselves, and are quite at home as Australians.