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What type of bird was traditionally used in coal mines?
Answer – Canary – The tradition of taking canaries into coal mines dates back to 1911. Scientist John Haldane recommended their use to detect toxic carbon monoxide fumes. The poisonous gas is odorless, so miners would have no way of detecting its presence until they got sick, or worse, died. Haldane suggested that the birds would be a good warning — if the bird died, the miners would know to evacuate. Canaries were used in British mines until 1986, when electronic detectors took over. Nevertheless, the phrase “canary in a coal mine” is still used to describe an early warning of danger.:
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