Kangaroos belong to a group of marsupials called macropods, which means 'great footed animals'. Macropods have strong back legs with long feet. They hop on their back legs when travelling, using the muscular tail as a balance. Hopping in this way is an energy-efficient way of travelling long distances. Their front legs are small. When moving slowly, usually as they graze or to change position, the tail and front legs prop up the animal, and the back legs move forward The Grey Kangaroo is found along most of the eastern half of Australia.