This handsome scamp was in the Midwood in Prospect Park, midway between Rick’s Place & the Boulder Bridge. I believe it is one of the nightjars, a whip-poor-will, Caprimulgus vociferus, primarily because a) it doesn’t look as big as a Chuck-will’s-widow (the birds’ common names are based on what their song sounds like) is supposed to be, and b) the common nighthawk has pale bars on the primaries and strong white neck mark, both missing here. It was, in short, a process of elimination.
And other opinion seems to confirm that it is indeed a whip-poor-will.
Listen to one. Since our bird is thought to be a female, however, a half dozen of us did not hear this at twilight.