Why are norwich city called the canaries?

Answer 1

The miners in Norwich used to bring caneries down the mines** with them. If the canary fainted then theminer knew that he was breathing poisonous gasses. So he quickly blew out his candle and ran for his life.

The also used to breed caneries in Norwich which contribute to the name.

**What mines are there in norwich?
Because they play in yellow and are not called the bananas or lemons