blue canary
n.— «I’ve got to admit I was only a little surprised by the fact that the cops ran in the building without gear, common sense, etc. Have you ever seen cops approach the scene of a possible Haz-Mat incident? They’re not called “Blue Canaries” for nothing!» —“Re: COPS last saturday” by Harry Fell Usenet: misc.emerg-services Sept. 14, 1995. (source: Double-Tongued Dictionary)
Further reading
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One secret to writing well is … there is no secret! There’s no substitute for simply sitting down day after day to practice the craft and learn from your mistakes. Plus, childhood mixups around word definitions can lead to some funny stories...