More than 200 years ago, English explorers arrived on the shore of Australia. They were surprised to see large animals hopping about as if on springs! Today, kangaroos continue to amaze us. There are more than 50 different kinds of kangaroos that can be of different sizes from tiny to tall. The rat-⁠kangaroo is the smallest and weighs only about 500 grams. The largest, the red kangaroo, can stand as tall as a man and weigh 100 kg. Kangaroos move by hopping. They have very large back legs and feet. These legs are very strong and muscular. They also have large strong tails. Thanks to the muscles, kangaroos can hop with enormous power. The large kangaroos can cover more than 60 meters with each hop. They can move easily at the speed of 30 km per hour. And they can reach a top speed of over 80 km per hour.