The intelligence of the elephant is widely known. We say, "the elephant never forgets," in honor of its excellent memory. Elephants are also surprisingly good at solving problems. An Indian farmer who kept elephants discovered this fact, to his misfortune. He had noticed that his elephants were eating his bananas at night. No fence could keep out the elephants, of course, so he decided to tie bells on them. Then he would hear them when they came to eat the bananas and he could chase them away. A few mornings later, however, the bananas were all gone, though he had heard nothing at night. When he checked the elephants he found that they had played a trick on him. They had filled the bells with mud so they would not make any noise!