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 banana and he could chase them away.
a few mornings later, however, the bananas were all gone, though he had heard nothing at nigh.
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.