English KS1/KS2: Aesop's Fables - 12. The Donkey in the Lion's skin
Tired of being laughed at by the other animals, a donkey wishes it was something else. Its wish seems to be granted when it finds a lion costume. When it puts it on, it starts to inspire respect in the other animals. When it comes across a fox it becomes over-confident, thinking it will sound like a lion of it tries to roar. The resulting bray gives it away, and the fox pulls off its costume, making the other animals laugh at the donkey again.