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
2012-06-25· The English expression with canary isn't any more idiomatic in English than the French translation, though it would be readily understood. What is idiomatic is the use of the term "guinea pig" (cobaye) which unfortunate creature is often involved in experiments to ascertain if some substance e.g. liprstick or face powder can be harmful to humans.
A domestic canary, of the type historically used to detect gas in coal mines. Sentinel species are organisms, often animals, used to detect risks to humans by providing advance warning of a danger. The terms primarily apply in the context of environmental hazards rather than those from other sources.
2018-09-20· An allusion to caged canaries (birds) that miners would carry down into the mine tunnels with them. If dangerous gases such as carbon monoxide collected in the mine, the gases would kill the canary before killing the miners, thus providing a warning to exit the tunnels immediately