howling survey
 n.— «Every so often, they would stop their truck, step out, and howl. The technique, known as a howling survey, is one way for wildlife officials to make contact with and count the number of wolves in an area.» —“New wolf pack discovered in Oregon” by Dennis Newman KGW-TV (Portland, Oregon) July 21, 2008. (source: Double-Tongued Dictionary)

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