How do you define worth in the mouse and the lion

Set againist the African Serengeti of Tanzania and Keyna, a single small mouse escapes the claws of a hungry owl, only to find herself trapped within the paw of a huge lion. On a whim, the lion lets the mouse go and then sets about his merry way. Unfourntley, poachers have been putting up traps. And before he knows it the lion is caught and bound in nasty ropes, high above the ground. To his resuce comes the little mouse, and she nibbles the ropes until they give away and free the lion. Then the cubs of the lion escourt the mouse home safetly. 

Even though you are small you still are helpful at times