This species frequently kills and eats the bird commonly called the Pheasant (Tetrao Umbellus). Partridges and young hares are also favourite dainties. It also follows the Wild Pigeons in their migrations, and always causes fear and confusion in their ranks.
It breeds in the mountainous districts of the Middle and Northern States, to which it returns early in spring from the Southern States, where it spends the winter in considerable numbers, and is known by the name of the Great Pigeon Hawk. So rapidly must they travel from one extremity of the country to another, to reach the places to which they resort for the purpose of breeding, that I have seen them copulate in Louisiana, where they never breed, in the month of February, and have found their nest with eggs in which the chick was far advanced, in the State of Connecticut, on the 20th of April.
The nest is usually placed in the forks of the branch of an Oak-tree towards its extremity. In its general appearance it resembles that of the Common Crow, for which I have several times mistaken it. It is composed externally of numerous crooked sticks, and has a slight lining of grasses and a few feathers. The eggs are three or four, almost globular, large for the size of the bird, of a dullish-white colour, strongly granulated, and consequently rough to the touch. It was on discovering one of these nests that I wounded the second adult male which I have seen, but which never returned to its nest, on which I afterwards shot the female represented in the Plate, in the act of pouncing. I have several times found other nests of birds of this species, but the owners were not in full plumage, and their eyes had not obtained the rich orange colouring of the adult birds.
Those which I have observed near the Falls of Niagara were generally engaged in pursuing Red-winged Starlings, over the marshes of the neighbourhood. When this Hawk is angry, it raises the feathers of the upper part of the head, so as to make them appear partially tufted. The cry at this time may be represented by the syllable kee, kee, kee, repeated eight or ten times in rapid succession, and much resembling that of the Pigeon Hawk (Falco columbarius) or the European Kestril. The young of this species bear no resemblance to those of the Goshawk, of which a figure will be given in the same Plate with the adult of the Stanley Hawk.
Stanley Hawk, Falco Stanleii.
Adult Male.
Bill short, robust, cerate; upper mandible with the dorsal outline curved from the base, the back rounded, the sides sloping at the base, convex toward the end, the margin sharp, overlapping, having an obtuse lobe, the tip trigonal, very acute, and curved downwards; lower mandible broadly rounded on the back, convex on the sides, acute in the edges, somewhat abrupt at the end. Nostrils oval, oblique, in the fore-part of the cere. Head rather large, flat above; eyebrow acute and projecting. Neck strong. Body rather elongated. Legs long; tarsi rather long, and with the toes somewhat slender, the former scutellate anteriorly, the latter scutellate above, papillar and tuberculate beneath; claws long, curved, roundish, rather slender, and extremely acute.
Plumage compact, imbricated, glossy. Space between the beak and eye sparsely covered with bristly feathers. Tibial feathers rather compact, and not much elongated. Wings long: fifth quill longest, sixth and fourth nearly equal, first very short. Tail long, straight, a little rounded, of twelve rather broad feathers.
Bill light blue at the base, black at the tip. Cere greenish-yellow. Iris reddish-orange. Tarsus and toes bright yellow; claws brownish-black. The general colour of the upper parts is dark greyish-brown. Quills barred with brownish-black. Tail with four bars of brownish-black, the terminal one broader; the tips of all the feathers white. The general colour of the lower parts is brownish-white. Sides of the head and the throat longitudinally lined with dark brown; fore-neck and breast marked with arrow-shaped spots of brownish-red, the shafts blackish. Legs similarly marked, the spots smaller, and transversely elongated. Abdomen and under tail-coverts nearly free of spots.
Length 20 inches, extent of wings 36; beak along the back 1¼, along the gap from the tip of the lower mandible 1¼; tarsus 2¾, middle toe 2½. Wings 4½ inches shorter than the tail.