canary in a coal mine

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canary in a coal mine

Something or someone who, due to sensitivity to his, her, or its surroundings, acts as an indicator and early warning of possible adverse conditions or danger. Refers to the former practice of taking caged canaries into coal mines. The birds would die if methane gas became present and thereby alert miners to the danger. Wildlife in disaster movies assumes the role of the canary in a coal mine, fleeing the scene when catastrophe is imminent. Unaware that he had been given the test drug, John was used as a canary in a coal mine to see its effects on the human mind.
See also: canary, coal, mine
References in periodicals archive ?
This latest canary in a coal mine should shake us out of our collective apathy.
Ice shelves along the coast of Antarctica may play the role of the canary in a coal mine when it comes to global warming.
It's definitely a canary in a coal mine," suggests Louis Guillette, a UF zoology professor.