Birds of America
By John James Audubon, F. R. SS. L. & E.
VOLUME I.
GENUS II.--CHORDEILES, Swains. NIGHT-HAWK.
Mouth opening to beneath the centre of the, eyes; bill extremely small;
upper mandible with the tip decurved, and a deep lateral groove. Nostrils
oblong, prominent, marginate. Eyes very large. Aperture of ear elliptical,
very large. Head very large, depressed, but less so than in Caprimulgus. Claw
of middle toe pectinate. No bristles at the base of the upper mandible. Wings
very long, pointed, with the first quill longest, and the secondaries very
short. Tail emarginate.