[Answer] Which animal was used in coal mines as a safety measure?

Step 1 : Introduction to the question "Which animal was used in coal mines as a safety measure?"

...Canaries were regularly used in coal mining as an early warning system. If dangerous gases such as carbon monoxide collected in the mine, the gases would kill the canary before killing the miners, thus providing a warning to exit the tunnels immediately. Why use a bird instead of, say, a mouse? It all had to do with the birds’ breathing anatomy: canaries get a dose of air when they inhale and when they exhale, thus a double dose of toxic gases. The phrase "canary in a coal mine" is frequently used to refer to a person or thing which serves as an early warning of a coming crisis.

Step 2 : Answer to the question "Which animal was used in coal mines as a safety measure?"

Canary:

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