By the time Alberta and British Columbias coal industry started, safety lamps had replaced canaries as a firedamp indicator.
However, the bird still had its uses, and firebases continued to carry the canary to detect other harmful gases, such as afterdamp, a combination of carbon monoxide and carbon dioxide that replaces oxygen in the air.
Budgies faint when exposed to afterdamp, indicating the presence of gas before it reaches excessively dangerous levels.
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