"The term decoy may refer to two distinct devices, both used for hunting wildfowl. One is a long cone-shaped wickerwork tunnel installed on a small pond ...
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to catch wild ducks. After the ducks settled on the pond, a small, trained dog would herd the birds into the tunnel. The catch was formerly sent to market for food, but now these are used only by ornithologists to catch ducks to be ringed and released. The word decoy, also originally found in English as "coy", derives from the Dutch de Kooi (the cage) and dates back to the early 17th century, when this type of duck trap was introduced to England from the Netherlands. As "decoy" came more commonly to signify a person or a device than a pond with a cage-trap, the latter acquired the retronym "decoy pool".[citation needed]" - (en.wikipedia.org 31.08.2020)