A History of North American Birds, Land Birds. Volume 3. Robert Ridgway

Чтение книги онлайн.

      Sp. Char. In colors almost exactly similar to F. gyrfalco, var. labradora. Above continuous dark vandyke-brown, approaching brownish-black on the head, which is variegated only on the gular region, and inclining to grayish-brown on the tail; the whole surface entirely free from spots or markings of any kind. Beneath similar in color to the upper parts, but the feathers edged with whitish, this rather predominating on the throat; flanks and tibiæ with roundish white spots; lower tail-coverts with broad transverse bars of white. Lining of the wing with feathers narrowly tipped with white; inner webs of primaries with narrow, transverse elliptical spots of cream-color; inner webs of tail-feathers with badly defined, irregular, similar spots, or else with these wanting, the whole web being plain dusky-brown.

      No. 12,022 (♀, Oregon; T. R. Peale). Wing, 15.00; tail, 8.50; culmen, .95; tarsus, 2.10; middle toe, 2.15. (Figured by Cassin as F. polyagrus, in Birds of California and Texas, pl. xvi.)

      No. 45,814 (♀, Sitka, Alaska, May, 1866; F. Bischoff). Wing, 14.90; tail, 8.50; tarsus, 2.10; middle toe, 2.20. The two similar in color, but in the latter the white streaks on the lower parts a little broader, and the middle of the auriculars slightly streaked.

      Hab. Northwest coast of North America, from Oregon to Sitka.

      This curious race of Falco communis is a good illustration of the climatic peculiarity of the northwest coast region, to which I have often referred before; the same melanistic tendency being apparent in birds of other species from the same region, as an example of which I may mention the Black Merlin (Falco æsalon, var. suckleyi), which is a perfect miniature of the present bird.

      Habits. The Great-footed Hawk of North America is very closely allied to the well-known Peregrine Falcon of Europe, and so closely resembles it that by many writers, even at the present day, it is regarded as identical with it. Without doubt, the habits of the two races are very nearly the same, though the peculiarities of the North American bird are not so well known as are those of the European. In its distribution it is somewhat erratic, for the most part confined to the rocky sea-coast, the river-banks, and the high ground of the northeastern parts of America. It is known to breed in a few isolated rocky crags in various parts of the country, even as far to the south as Pennsylvania, and it occurs probably both as migrant and resident in several of the West India Islands, in Central and in South America. A single specimen was taken by Dr. Woodhouse in the Creek country of the Indian Territory. Two individuals are reported by Von Pelzeln as having been taken in Brazil. The Newtons met with it in St. Croix. Mr. Gosse found it in Jamaica, and Dr. Gundlach gives it as a bird of Cuba. Jardine states it to be a bird of Bermuda, and also that it has been taken in the Straits of Magellan. A single specimen was taken at Dueñas, Guatemala, in February, by Mr. Salvin.

      On the Pacific coast this Falcon has been traced as far south as the limit of the land. Dr. Cooper met with only two pairs, in March, 1854, frequenting a high wooded cliff at Shoal-water Bay. Dr. Suckley procured a single specimen from Steilacoom. Dr. Cooper states that the habits of these corresponded with those described for the F. anatum and F. peregrinus, and that, like these Falcons, it is a terror to all land animals weaker than itself. It is said to breed on the rocky cliffs of the Pacific.

      An individual of this bird was taken by Colonel Grayson at the Tres Marias Islands. When shot, it was endeavoring to capture a Sparrow-hawk, indicating its indifference as to the game it pursues. He adds that this bird attacks with vigor everything it sees, from the size of a Mallard Duck down, and is the terror of all small birds. Its range must be very great, as it often ventures far out to sea. On his passage from Mazatlan to San Francisco, in 1858, on the bark Carlota, one of these Falcons came on board more than a hundred miles off the coast of Lower California, and took up its quarters on the main-top yard, where it remained two days, during which time it captured several Dusky Petrels. It would dart headlong upon these unsuspecting birds, seldom missing its aim. It would then return to its resting-place and partly devour its prize. At other times it dropped its victims into the sea in wanton sport. Finally, as if tired of this kind of game, it made several wide circles around the ship, ascended to a considerable height, and departed in the direction of the Mexican shore.

      This Falcon is found along the Atlantic coast from Maine to the extreme northern portion, breeding on the high rocky cliffs of Grand Menan and in various favorable situations thence northward. A few breed on Mount Tom, near the Connecticut River in Massachusetts, on Talcott Mountain in Connecticut, in Pennsylvania, and near Harper’s Ferry, in Maryland.

      Mr. Boardman has several times taken their eggs from the cliffs of Grand Menan, where they breed in April, or early in May. In one instance he found the nest in close proximity to that of a pair of Ravens, the two families being apparently on terms of amity or mutual tolerance.

      For several years two or more pairs of these birds have been known to breed regularly on Mount Tom, near Northampton. The nests were placed on the edges of precipitous rocks very early in the spring, the young having been fully grown by the last of June. Their young and their eggs have been taken year after year, yet at the last accounts they still continued to nest in that locality. Dr. W. Wood has also found this species breeding on Talcott Mountain, near Hartford. Four young were found, nearly fledged, June 1. In one instance four eggs were taken from a nest on Mount Tom, by Mr. C. W. Bennett, as early as April 19. This was in 1864. Several times since he has taken their eggs from the same eyrie, though the Hawks have at times deserted it and sought other retreats. In one year a pair was twice robbed, and, as is supposed, made a third nest, and had unfledged young as late as August. Mr. Allen states that these Hawks repair to Mount Tom very early in the spring, and carefully watch and defend their eyrie, manifesting even more alarm at this early period, when it is approached, than they evince later, when it contains eggs or young. Mr. Bennett speaks of the nest as a mere apology for one.

      This Hawk formerly nested on a high cliff near the house of Professor S. S. Haldeman, Columbia, Penn., who several times procured young birds which had fallen from the nest. The birds remained about this cliff ten or eleven months of the year, only disappearing during the coldest weather, and returning with the first favorable change. They bred early in spring, the young leaving the nest perhaps in May. Professor Haldeman СКАЧАТЬ