A big lion is sleeping in the forest. A small mouse runs over the lion. The lion wakes up. 'I will eat you!' he says. The mouse is afraid. 'Please let me go. I can help you one day,' says the mouse. The lion laughs, but he lets her go. One day, the lion is in a net. He cannot move. The mouse comes and bites the net. The lion is free. The lion says, 'Thank you.' Even small friends can help.