Captain Blakiston, having enjoyed unusual opportunities for observing the habits of the American Raven during his residence in high northern regions, characterizes the species as anything but solitary. During the day they are usually met with in pairs, except when drawn together in large numbers around the carcass of a dead animal. At night, during the winter, they repair to some chosen resting-place, usually a clump of trees on the edge of a prairie, and there roost in one immense body. One of these roosting-places was about a mile from Fort Carlton, and Captain Blakiston’s attention was first drawn to it by noticing that about sunset all the Ravens, from all quarters, were flying towards this point. Returning to the fort in the evening by that quarter, he found a clump of aspen-trees, none of them more than twenty-five feet high, filled with Ravens, who, at his approach, took wing and flew round and round. He also noted the wonderful regularity with which they repaired to their roosting-place in the evening and left it again in the morning, by pairs, on their day’s hunt. They always left in the morning, within a minute or two of the same time, earlier and earlier as the days grew longer, on cold or cloudy mornings a little later, usually just half an hour before sunrise. In April they all paired off, and their roosting-place became deserted. During an excursion about one hundred and fifty miles southwest of Fort Carlton, Captain Blakiston found several nests of Ravens with eggs, one of which was in a small tree near a lake, and was not more than fifteen feet above it. It contained six eggs, was about a foot in diameter, composed of sticks, and was lined with buffalo-hair and pieces of scarlet cloth, evidently picked up about an Indian camping-ground.
Dr. Heermann states that while in California he always found the nests of the Raven placed high on bold precipitous cliffs, secure against danger; in the vast desolate plains of New Mexico he saw these birds building on low trees, and even on cactus-plants, less than three feet from the ground, showing how much circumstances and localities affect the habits of birds regarding incubation.
A Raven, probably this species, is abundant on the plateau of Mexico. The Cerro Colorado, near Tehuacan, is the rendezvous of a large number of these birds, where, according to Sumichrast, at the time of the flowering of the maguey, they gather in great abundance, to feed on the blossoms of this plant, which are their favorite food.
Mr. Boardman writes me that he has several times collected Ravens’ eggs at Grand Menan, but always found the nest a hard one to take, as they
usually build it under some high cliff. They make a very large and bulky nest, and, where not disturbed, use it several years in succession. They also breed very early. He once took a nest with eight eggs on the 10th of April, when the snow all around was quite deep. This was sent to the Smithsonian Institution. Its contents nearly filled a bushel basket. He does not regard the Ravens as migratory. Though they are apparently more numerous in winter than in summer, this is probably because they forsake the woods and come about the open fields and the banks of rivers for dead fish, and thus are more noticed. They are very shy, sagacious, and vigilant, so much so that it is almost impossible for one to get a shot at them. Crows avoid them, and the two are never seen together. The farmers of Grand Menan accuse them of pecking the eyes out of young lambs, and always try to destroy them, and they grow less and less numerous every year. The Ravens, he adds, appear to be on good terms with the Duck Hawks, as he has known a nest of the former within a few rods of one of the latter.
An egg of this species, from Anderson River, measures 1.96 inches in length by 1.32 in breadth. Two from Grand Menan measure, one 2.05 inches by 1.30, the other 1.95 by 1.25. The ground-color of two of these is a soiled sea-green, that of the third is a light bluish-green. This is more sparingly marked with dots, blotches, and cloudings of faint purple and purplish-brown, chiefly at the larger end. The others are marked over the entire egg with blotches of varying size and depth of coloring, of a deep purple-brown; some of the markings are not readily distinguishable from black.
Corvus cryptoleucus, Couch.
WHITE-NECKED CROW.
Corvus cryptoleucus, Couch, Pr. A. N. Sc. VII, April, 1854, 66 (Tamaulipas, Mexico).—Baird, Birds N. Am. 1858, 565 pl. xxii.—Cooper, Orn. Cal. I, 1870, 284.
Sp. Char. The fourth quill is longest; the third and fifth equal; the second longer than the sixth; the first about equal to the seventh. Glossy black, with violet reflections; feathers of neck all round, back, and breast, snow-white at the base. Length, about 21.00; wing, 14.00; tail, 8.50. Feathers of throat lanceolate; bristly feathers along the base of the bill covering it for nearly two thirds its length.