I knew about the canary. My dh is an electrician in a coal mine and fortunately they don't have much gas, but they have a lot of water. They can always tell when the water is rising because the rats go to higher shelter.
The birdcage has a fake canary in it but at the time the mines were active they did have a birdcage like this with a canary in it. If the canary died they knew dangerouses gases were escaping and evacuated immediately.
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