A canary is a small songbird, often yellow, that is kept as a pet for its singing. Historically, canaries were also used in coal mines to warn miners of dangerous gases.
Named after the Canary Islands, from Spanish 'Islas Canarias,' possibly from Latin 'Canariae Insulae' meaning 'Islands of Dogs' due to large dogs found there. The birds were native to those islands and took their English name from them. The color term 'canary yellow' comes from the bird.
The famous yellow bird is actually named after islands that were named after dogs—a chain of naming that surprises most people. Miners once trusted canaries more than machines: if the bird stopped singing or died, it meant invisible gases were present. The phrase 'canary in a coal mine' still means an early warning sign.
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