The most remarkable difference with respect to habits, between these birds and the American Vultures, is the power which they possess of carrying their prey in their talons. They often walk about, and in the water, in search of food, and now and then will seize on a frog or a very young alligator with their claws, and drag it to the shore. Like the Vultures, they frequently spread their wings towards the sun, or in the breeze, and their mode of walking also resembles that of the Turkey Buzzard.
Polyborus vulgaris, Vieillot, Galerie des Ois. pl. vii.
Falco brasiliensis, Gmel. Syst. Nat. vol. i. p. 262.—Lath. Ind. Ornith. vol. i. p. 21.
Caracara, Raii, Synops. p. 17.—Caracara ordinaire, Cuv. Regne Animal, vol. i. p. 328.
Brazilian Kite, Lath. Synops. vol. i. p. 63.
Adult Male. Plate CLXI. Two figures.
Bill rather long, very deep, much compressed, cerate for one-half of its length; upper mandible with the dorsal outline nearly straight, but declinate for half its length, curved in the remaining part, the ridge narrow, the sides flat and sloping, the sharp edges slightly undulated, the tip declinate, trigonal; lower mandible with the sides nearly erect, the back rounded, the tip narrow, and obliquely rounded. Nostrils oblong, oblique, in the fore and upper parts of the cere. Head of moderate size, flattened; neck rather short, body rather slender. Feet rather long and slender; tarsus rounded, covered all round with hexagonal scales, the anterior much larger, and the five lower broad and transverse; toes of moderate size, scutellate above, the inner scaly at the base; the outer is connected with the middle-toe, at the base by a web, as is the inner, although its web is smaller; lateral toes equal, middle one considerably longer, hind-toe shortest, and not proportionally stronger; claws long, arched, roundish, tapering to a point.
Plumage compact, slightly glossed. Upper eye-lid with short strong bristles; space before the eye, cheeks, throat, and cere of both mandibles, bare, having merely a few scattered bristly feathers. Feathers of the head, neck, and breast narrow; of the back broad and rounded; outer tibial feathers elongated, but shorter than in most Hawks. Wings long, reaching to within two inches of the tip of the tail; primaries tapering, secondaries broad and rounded, with an acumen; the fourth quill longest, third scarcely shorter, first and seventh about equal; almost all the primaries are more or less sinuate on their inner webs, and the second, third, fourth, fifth, and sixth on their outer. Tail long, rounded, of twelve broadish, rounded feathers. There is a large bare space on the breast, as in the Turkey Buzzard.
Bill pale blue, yellow on the edges, cere carmine. Iris dark-brown. Feet yellow; claws black. Upper part of the head umber-brown, streaked with brownish-black. Feathers of hind-neck and fore part of the back light brownish-yellow, mottled with dark brown towards the end. Back and wings dark brown, edged with umber. Primaries and some of the secondaries barred with broad bands of white, excepting towards the end. Tail coverts dull-white, slightly barred with dusky. Tail greyish-white, with sixteen narrow bars, and a broad terminal band of blackish-brown, the tips lighter. Fore part and sides of the neck light brownish-yellow; the fore part of the breast marked like that of the back, the yellow colour extending over the lateral part of the neck; the hind part, abdomen, sides, and tibia dark brown; the lower tail-coverts yellowish-white. Interior of mouth and skin of the whole body bright yellow.
Length 23½ inches, extent of wings 4 feet; bill along the ridge 2¼, the cere being 1, along the edge 2¼; tarsus 3¼, middle-toe and claw 3¾.