04/28/2020
For many years, before modern equipment replaced them, canaries were the best way to detect carbon monoxide gas deep under ground in a coal mine. This picture from 1928 shows a miner and his little friend. How did it work? Well, canaries are small and a very little bit of a gas like carbon monoxide will kill them. So the death of his canary would warn the miner to get out of the mine before he suffered the same fate. Ok now you know about canaries and
coal mines, but how do frogs fit in?