Canaries are little yellow birds canary in a coal mine.

Why are these cute birds in a dark colon?

Did you hear about Sarah?

The boss took her to dinner and then fired her.

The next day, the same thing happened to Jason.

Boss took him to dinner and then fired him.

Dinner with the boss is like a canary in a coal mine.

The expression canary in a coal mine is used as a warning.

If a canary breeze poisonous gases, it gets sick and dies more quickly than a human would.

Coal miners used to bring these birds into the minds with them if the Canaries miners knew the air was not healthy and that's English in a minute.