At times this Hawk is seen to fly high, in a desultory manner, with quick but irregular movements of the wings, now moving in short and unequal circles, pausing to examine the objects below, and then again descending rapidly and following a course only a few feet from the ground, carefully examining each patch of small bushes in search of small birds. Besides the smaller birds, young chickens, and pigeons, this Hawk has been known to occasionally feed on small reptiles and insects, as also upon the smaller quadrupeds. Mr. Audubon speaks of having met with three nests of this species, and all in different situations. One was in a hole in a rock on the banks of the Ohio River; another was in the hollow of a broken branch, near Louisville, Ky., and the third in the forks of a low oak, near Henderson, Ky. In the first case, the nest was slight, and simply constructed of a few sticks and some grasses, carelessly interwoven, and about two feet from the entrance of the hole. In the second instance there was no nest whatever, but in the third the birds were engaged in the construction of an elaborate nest. The number of the eggs was four in one instance, and five in another. He describes them as almost equally rounded at both ends; their ground-color white, with a livid tinge, but scarcely discernible amid the numerous markings and blotches of reddish-chocolate with which they were irregularly covered. In a nest which was large and elaborately constructed of sticks, and contained five eggs, found by Dr. H. R. Storer in Concord, Mass., there was a single egg which nearly corresponds with this description. It is, however, the only one among many specimens that at all agrees with it. This specimen is a little more than usually elongate, and its ground-color, which is a purplish-white, is nearly concealed by its blotches of various shades of sepia-brown. In every other instance the egg is very nearly spherical, the ground-color white, and beautifully marked with large confluent blotches of sepia, varying in depth from quite a light to a very dark shade. In one, these confluent markings form a broad belt around the centre of the egg. In others, they are chiefly distributed about the larger end. The contrast between the white ground and the dark confluent dashes of brown is very striking. Except in size, the eggs of this bird bear a marked resemblance to those of the Sparrow Hawk of Europe. In a few instances, the brown markings have an intermixture of red and purple. The egg measures 1.35 by 1.15 inches.