Instructions
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Purchase healthy, active male canaries. They should have smooth plumage and should sing when in their cages. You'll need two canaries per pit.
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2
Gently lower the canaries into the mine with you, and move them carefully when below ground to prevent them from being injured.
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3
Listen carefully to the canary's song during the workday. If the song stops, check the canary immediately.
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4
Watch the canary. If it stops singing, begins to wobble or sway on its perch, or falls off the perch and lies still on the floor of the cage, evacuate the area immediately; the canary is likely reacting to high levels of toxic gases. Take the canary with you; it may revive in fresh air.
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