LONDON - After decades of loyal service, the last pit-face canaries and finches have retired from their life-saving duties as early warning systems in coal mines. New technology and laws governing safety in mines mean the birds are no longer needed to detect lethal pockets of colourless and odourless carbon monoxide.
Coal canaries to put their feet up
LONDON - After decades of loyal service, the last pit-face canaries and finches have retired from their life-saving duties as…
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