Belling the Cat

Belling the Cat, also known as The Bell and the Cat or The Mice in Council is a story which has become a traditional part of European and Western culture.
History.
The story may have come from Aesop. The earliest recorded versions are from the Middle Ages.
Story.
The story is about a group of mice who talk about what to do about a cat which threatens them. One wants to place a bell around the cat's neck. All agree. Then one mouse asks who will volunteer to put the bell on the cat? Not one stepped forward.
The story is about the difference between a good idea and what may be needed to convert an idea into action.
Idiom.
The story gives us the idiom "to bell the cat", which means to try an impossible or near-impossible task. In other words, it is easier said than done.