English KS1/KS2: Aesop's Fables - 37. The too fat Fox
In the course of a harsh winter, a fox becomes thinner and thinner until he fears that he will starve. One day he comes across a large amount of food inside a hollow tree, this having been hidden there a short while previously by a man who believes the hole in the trunk to be too small for any animal to get through.
The fox can get through the whole having become so thin. He eats all the food, but finds himself too fat to get out. He has to wait for a few days until he is thin again before he can get out again.