I first learned this word on a TV nature program, describing the way raptors hold their wings
partially outstretched, to hide foot at their feet, presumably to keep other raptors from
seeing it. On another TV program, I saw anhinga, a water bird that catches small fish, holding
wings in same way, quite possibly to lure prey into the shadow where they could be caught.
I have seen live mockingbirds doing it where grass had been recently cut, possibly again to
lure insects into the shadow, so that their movement could be seen, and the mockingbird could
catch them.
Can you think of other birds that do this?