A History of North American Birds, Land Birds. Volume 1. Robert Ridgway
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Название: A History of North American Birds, Land Birds. Volume 1
Автор: Robert Ridgway
Издательство: Public Domain
Жанр: Биология
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On the Pacific Coast the Robin is only a winter visitant in California; a very few remaining to breed, and those only among the hills. They reach Vancouver Island early in March, and are very abundant.
In New England, where the Robins are held in great esteem, and where they exist under very favorable circumstances, their numbers have very largely increased, especially in the villages. They cause not a little annoyance to fruit cultivators by their depredations upon the productions of the garden, especially cherries and strawberries. They are a voracious bird, and no doubt destroy a large quantity of small fruit, but there is abundant evidence that this is more than compensated by their destruction of the most injurious insects, upon which they wage an incessant war. The investigations of Mr. J. W. P. Jenks and Professor Treadwell establish conclusively their great services in this direction.
The experiments of the latter gentleman show that the nestlings of the Robin require a vast amount of animal food, forty per cent more than their own weight being consumed by the young bird within twenty-four hours, and, what is more, demonstrated to be necessary to its existence.
PLATE II.
1. Turdus confinis, Baird., Cape St. Lucas, 23789.
2. Turdus nævius, Gm. Cala., 21363.
3. Turdus migratorius, Linn., Penn., 1851.
4. Turdus iliacus, Linn., Europe.
In Massachusetts a few Robins remain throughout the year, but the greater proportion leave early in November, returning late in February or early in March.
The song of the Robin is deservedly popular. While many of our birds possess far superior powers of melody, and exhibit a much greater variety in their song, there are none that exceed it in its duration or extent. It is the first bird in spring to open and one of the last to close the great concert of Nature. Their song is earnest, simple, and thrilling, and is said by Audubon to resemble that of the European Blackbird, Turdus merula.
The Robin, when taken young, may be readily tamed, and soon becomes contented and accustomed to confinement. They are devoted to their young, watchful, attentive, and provident. They begin to construct their nest in early spring before the trees put forth their leaves, and often in very exposed positions. The size of the nest, in fact, makes concealment impossible. These nests are sometimes placed in quite remarkable positions, such as the beams of a ship partly finished, and where the carpenters were every day at work, and similar situations indicating a great familiarity. Their favorite place is the horizontal branch of an apple-tree, about ten feet from the ground.
The nest of the Robin is a large and coarsely constructed combination of rude materials. It is composed of a base of straw, leaves, mosses, stems, and dry grasses, upon which a cup-shaped fabric of clay or mud is built. The whole is lined with finer dry grasses and vegetable fibres. They average 5 inches in height and the same in diameter. Their cavity is 2¾ inches deep, with a diameter of 2½ inches.
The eggs of the Robin, which are usually five and sometimes six in number, are of a uniform bright greenish-blue color, liable to fade when exposed to light, but when fresh exhibiting a very distinct and bright tint. They vary in size from 1.25 to 1.12 inches in length, and in breadth from .88 to .75 of an inch. Their mean measurement is 1.18 by .81.
Turdus confinis, Baird, Rev. Am. B. 1864, 29.—Elliot, Birds America.—Cooper, Birds Cal., 9.
Sp. Char. No. 23,789. Entire upper parts and sides of head and neck uniform grayish-ash, with perhaps a faint tinge of olivaceous, less than in eastern specimens of T. migratorius. The central portions of the feathers of the top of head are rather darker than the edges, though almost inappreciably so, and not imparting a general dusky appearance. The chin and throat are white, streaked with ashy-brown. The jugulum and breast are pale yellowish-buff; the axillars, inner wing-coverts, and sides of the breast similarly, but rather more decidedly colored. The belly and edges of the crissal feathers are white, the hinder parts of the flanks ashy. There is a distinct whitish stripe from the lores over and a quarter of an inch behind the eye; the lower eyelid is also white. The tail-feathers are worn, but there is an indication of a narrow white tip. The feathers of the jugulum, especially of the sides, are tipped with ashy like the back, as in immature specimens of T. migratorius. The greater wing-coverts are tipped with dull white. The bill is yellowish; the upper mandible and the tip of lower tinged with dusky. The feet are pale brown.
The length cannot be given accurately, as the skin is much drawn up. The wing, however, measures 5.10 inches, its tip reaching 1.40 beyond the longest secondary; tail, 4.10; tarsus, 1.20; middle toe and claw, 1.07; exposed portion of culmen, .92; from tip to open portion of nostrils, .60.
Hab. Todos Santos, Cape St. Lucas.
The specimen with a general resemblance to an immature T. migratorius (especially the western variety) in the white superciliary streak and general markings, is much lighter beneath than in any of the many skins of T. migratorius examined; there being none of the dark chestnut or cinnamon shade, but rather a light buff; the belly and flanks are much more purely white. The superciliary stripe extends farther behind the eye; indeed, in most specimens of migratorius the white is nearly confined to the eyelids. The bill and wings are rather longer than usual in migratorius; the middle toe, on the other hand, appears shorter. Nothing is on record in regard to the habits of this bird.
Hesperocichla, Baird, Rev. Am. Birds, I, 1864, 12. (Type Turdus nævius, Gm.)
Turdus nævius.
9814
The single species of this subgenus differs in form from the Robins (Planesticus), in the more awl-shaped bill, the curved commissure, and the absence of a notch at the end; the longer, slenderer, and straighter claws; and in the dissimilarity in color of the sexes. In the latter respects it agrees with Merula of Europe and Middle America; in which, however, the bill is distinctly notched, and less attenuated. The tail is shorter and broader than in Planesticus, more as in true Turdus or Hylocichla.
Turdus nævius, Gm. S. N. I, 1788, 817.—Sclater, P. Z. S. 1857, 4; 1859, 331.—Baird, Birds N. Am. 1858, 219; Rev. Am. B. 1864, 32.—Cooper & Suckley, P. R. R. R. XII, II, 1859, 172.—Coues, Pr. A. N. S. 1866, 65. (Quotes occurrence on Colorado River, above Fort Mohave, as exceptional.)—Maynard (Massachusetts!).—Turnbull (N. Jersey!).—Dall & Bannister (Alaska).—Cooper, Birds Cal. 10. Orpheus meruloides, Rich. F. B. A. II, 1831, 187, pl. xxxviii.
Other figures: Vieillot, Ois. Am. Sept. II, 1807, pl. lxvi.—Aud. Orn. Biog. IV, 1838, pl. ccclxix, and ccccxxxiii.—Ib. Birds Am. III, pl. СКАЧАТЬ