A műszerek előtti időkben a szénbányászok egy kanárit vittek magukkal kalitkában a bánya mélyébe. A kanári érzékenyebb az oxigénhiányra mint az ember, így metán vagy szénmonoxid gáz felgyülemlés esetén a kanári korai figyelmeztető rendszerként működött. Már viszonylag kis szénmonoxid koncentrációnál sem kap levegőt. Ilyenkor abbahagyja a folyamatos csivitelést, éneklést. Ha elhallgatott a kanári, a bányászok tudták, hogy el kell hagyni a járatokat.
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