Wiktionary
duck call
n. 1 (context hunting English) Process by which a hunter lures waterfowl. 2 (context hunting English) Tool that is used to do make a duck call. (1)
Wikipedia
Duck call
A duck call may refer to either the process by which a hunter lures waterfowl, or the actual tool which he or she uses to do so. Early duck call tools were basic woodwind instruments, while later innovations are constructed of rubber and plastic, and allow the hunter to adjust the volume and tone of the calls.
Usage examples of "duck call".
The universe, in fact, began with the sound of a duck call, followed by a whistle and an enormous cosmic wind-break.