The British coal miners mentioned earlier used canaries to provide an early warning of the presence of poisonous gas. If a miner saw a bird fall from its perch, he knew he needed to act fast to survive.
همان طور که گفتیم کارگران معدن برای آگاهی از وجود گازهای سمی از قناری‌ها بهره می‌گرفتند .‏