Birds of America
By John James Audubon, F. R. SS. L. & E.
VOLUME I.
FAMILY IV. CAPRIMULGINAE. GOATSUCKERS.
Mouth opening to beneath the centre of the eyes; bill much depressed,
generally feeble, the horny part being small; upper mandible with the tip
somewhat decurved. Nostrils elliptical, prominent, marginate. Eyes extremely
large. Aperture of ear elliptical, very large. Head of extreme breadth,
depressed; body very slender. Feet very small; tarsus partially feathered,
scaly; anterior toes webbed at the base; hind toe small, and versatile, all
scutellate above; claw of third toe generally elongated, with the inner margin
thin and pectinate. Plumage very soft and blended. Wins very long, the second
and third quills longest. Tail long, of ten feathers. OEsophagus rather wide,
without crop; stomach very large, roundish, its muscular coat very thin, and
composed of a single series of strong fasciculi; epithelium very hard, with
longitudinal rugae; intestine short and wide; coeca large, oblong, narrow at the
base; cloaca globular. Trachea of nearly uniform width, without inferior
laryngeal muscles. Nest on the ground, or in hollow trees. Eggs generally two.
Young covered with down. Very nearly allied in some respects to the Owls.