Birds and Birding's Guide to:
Watching THE SPARROW-LIKE BIRDS
THE FREE-TOED PERCHING BIRDS
THE SHARP-BILLS
(Family Oxyruncidce)
Very closely related to the Tyrant-birds (Tyrannidce) are the members of this family, which are included in a single genus and three closely related forms. They agree with the Tyrant-birds in the form of the syringeal muscles, the exaspidean tarsal envelope, and in having the middle toe coherent with the outer toe for less than the whole length of its basal segment, while they differ from them in the sharp-pointed, wedge-shaped bill, and narrow instead of roundish nostrils. The bill is surrounded on lores, front, and under the chin by numerous, small, short bristly feathers, and another character is supposed to be afforded by the serrated outer web of the outer primary, but this is so faint”as to be practically non-existent."
The Sharp-bills are small birds a little over six inches in length, the general coloration above being olive-green with paler wing-edgings, the center of the crown spotted with black and with a median longitudinal patch of narrow, elongated dull scarlet or orange-red feathers, while the lower parts are pale yellowish or whitish, with bars and triangular spots of black; the sexes are alike except that in the female the crest is sometimes not quite so bright. The three forms have usually been regarded as distinct species, but according to Mr. Ridgway, who has recently studied them, they are”apparently mere geographic variations of a single species, which ranges from Costa Rica to southeastern Brazil.”Of the habits and life history of the Sharp-bills, we are in almost complete ignorance. Mr. Ridgway secured a single example of the Costa Rican Sharp-bill (Oxyruncus cristatus frater), which he found feeding in a tree frequented by Tanagers (Calo-spiza) and for which it was mistaken until it was shot.