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Usage examples:

• An hour after dark he came again, attracted, no doubt, by the continued quacking.

  - "Ways of Wood Folk", William J. Long.

• But when the ducks saw the barn- door raft sailing among them, they were afraid, and, quacking loudly, they paddled out of the way.

  - "Bunny Brown and His Sister Sue Playing Circus", Laura Lee Hope.

• Except the usual cry of the nightbirds and the quacking of frogs, which issued from the forest, no sound broke the silence which brooded over the water.

  - "The Three Lieutenants", W.H.G. Kingston.