I was a coal miner in South Wales U.K. Many years ago we used to take canaries down underground with us in a cage for methane gas testing.
The canary in the cage would be put on long stick and lifted into pockets in the ceiling of the coal face to check for the methane gas.
The canary would only die depending on the amount of gas in the ceiling pockets, most canaries do survive. there is no need to leave the mine.
Just get away from the area and the coal mines vetilation system normally takes the methane gas out.
When I left the coal mines the canaries were phased out and replaced by oil lamps, these lamps were a sealed flame and we used to blow a sample of the air pocket into the lamp.
If the flame exploded inside the lamp, this meant to much methane gas, if the flame went out, this meant just air.
Don't know about the bird on a wire? Goldie Hawn is well Hot!!!!....:D