pigeon flipping
n.— «Lately, troops say, insurgents have begun using a technique called pigeon flipping: while on patrol, the Marines have noticed flocks of pigeons circling above them, leading them to conclude that supporters of the insurgents have somehow trained the birds to signal when troops are in the area.» —“Looking Out on Hostile Territory” by Chris Allbritton, Sally B. Donnelly Time Nov. 14, 2005. (source: Double-Tongued Dictionary)
Further reading
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