Answer:
You should never tell a pigeon a secret because the police may know your secret soon after you tell it to the pigeon.
Step-by-step explanation:
- The term 'pigeon' is used to refer to the secret informers of the police in slang/informal language.
- To be specific, the police informers are known as 'stool pigeons'. The word 'stool' comes from an old French word 'estale'.
- In medieval Europe, estale used to be a bird that was used to lure other birds to come and get caught in the net.