Kangaroo is any marsupial of Kangaroo, which is mainly distributed in mainland Australia and parts of Papua New Guinea. Some of them are unique to Australia. Different kinds of kangaroos live in different natural environments in Australia, from rainforests and desert plains with cool climate to tropical regions.

The most famous kangaroo is red kangaroo, which is the largest and lives in the arid zone of Australia. The average annual rainfall in this area is less than 500mm. Because kangaroo's food contains a lot of water, it can survive in areas without running water. In fact, only male kangaroos are red and female kangaroos are gray-blue in red kangaroo, but red female kangaroos have also appeared under the conditions of group breeding and hybridization.

Red kangaroo is shaped like a mouse, like a giant mouse. It adapts to the jumping lifestyle. Its forelimbs are short and thin and can be used to catch food. Its hind legs are strong and its toes are joined together. It can jump 5 meters in one step and the speed can reach 40 ~ 65 kilometers per hour. When the tail grows up, it is the supporting organ when perching and the balancer when jumping.