What are the characteristics of kangaroos?

Kangaroo is a very interesting animal. It appeared in Australia 25 million years ago and is one of the oldest animals in the world. The red soil grassland in Australia is a paradise for kangaroos. These seemingly gentle but aggressive animals have short forelegs and very strong hind feet. They have long and thick tails, which can keep balance when jumping and support their bodies when standing. Kangaroos can jump more than 3 meters and run at 65 kilometers per hour, just like medium-speed cars. During the day, kangaroos usually rest in the shade of trees and come out for food when it is cool at night.