The male American Woodcock has an elaborate display to attract females. He gives repeated "peents" on the ground, often on remaining patches of snow in the early spring. After a time he flies upward in a wide spiral. As he gets higher, his wings start to twitter. After reaching a height of 70-100 m (230-328 ft) the twittering becomes intermittent, and the bird starts chirping as he starts to descend. He comes down in a zig-zag, diving fashion, chirping as he goes. As he comes near the ground he silently lands, near a female if she is present. Then he starts peenting again.The twittering sound is from air rushing over the tips of his wingfeathers, much like the whistling sound mourning doves make when they take off. There's a video on this page with the sounds. The one time I heard it, the whistling and the chirping made me think of tiny fuzzy flying saucers.
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posted by Burhanistan at 3:03 PM on February 3, 2010