Underground miners worried about odorless gas poisoning them, so they would take a canary down with them, with its much higher metabolism it would succumb to the gas much faster than the humans. So watch the canary, and when it dies, haul ass outta there.
Underground miners worried about odorless gas poisoning them, so they would take a canary down with them, with its much higher metabolism it would succumb to the gas much faster than the humans. So watch the canary, and when it dies, haul ass outta there.
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