Birds of America
By John James Audubon, F. R. SS. L. & E.
GENUS I.--IBIS, Cuv. IBIS.
Bill very long, slender, higher than broad, compressed, tapering, arched,
obtuse; upper mandible with the dorsal line arched in its whole length, the
ridge convex, broader towards the end, the sides at the base erect, towards the
end very convex and narrow, separated in their whole length from the ridge by a
deep narrow groove, the edges inflected and sharp; lower mandible more slender,
its angle very narrow, and protracted in the form of a groove to the tip.
Nostrils basal, dorsal, linear. Head small, compressed, oblong, bare before the
eyes; neck long and slender; body rather slender. Feet very long, slender;
tarsi scutellate; anterior toes connected by membranes at the base. Claws
rather small, slightly arched, pointed. Wings long, ample, with the second
quill longest. Tail short, nearly even, of twelve feathers. OEsophagus wide,
like that of a Heron; stomach inuscular.