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A curious thing frequently noticed about these birds as they come in at night is their power to make their wings noisy or almost silent at will. Sometimes the rustle is so slight that, unless the air is perfectly still, it is scarcely audible; at other times it is a strong wish-wish that can be heard two hundred yards away. The only theory I can suggest is that it is done as a kind of signal.
Reapers were at work in the wheat below, but already much of the corn had been carried, and the hum of a threshing engine came up from the ricks. A woodpecker called loudly in the beech wood; a "wish-wish" in the air overhead was caused by the swift motion of a wood-pigeon passing from "holt" to "hurst," from copse to copse.
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