One day, a wild hippo went to the river to drink water. He felt very tired and wanted to sleep. He looked around and saw a big tree with soft grass under it. The hippo went to the tree and lay down on the grass to sleep.
A little bird saw the sleeping hippo and flew down to talk to him. "Hello, Mr. Hippo! Why are you sleeping here?" the bird asked. The hippo opened his eyes and said, "I am very tired, and the grass is soft. It is a good place to sleep."
But then, something unexpected happened! The tree started to shake, and the hippo and the bird looked up. They saw a big monkey jumping from one branch to another. The monkey was making a lot of noise, and the hippo could not sleep anymore. The hippo was sad, but the bird had an idea. 
The bird told the monkey, "Please be quiet, our friend hippo needs to sleep." The monkey felt sorry and stopped jumping. The wild hippo closed his eyes, and with the help of his new friends, he could finally sleep peacefully under the tree.
