Читать книгу Nests and Eggs of Birds of the United States - Thomas G. Gentry - Страница 10

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The Cedar-Bird, though mainly a denizen of the wooded regions of North America, and occasionally of cultivated fields and orchards, has been known to nest from Florida to the Red River country. But, wherever found during the non-breeding period, it is the same gregarious, nomadic species.

After the beginning of October, the search for food so completely engrosses the attention, that it is not until the latter part of May, or the beginning of June, that the flocks break up into pairs.

Nidification now becomes the all-absorbing passion, and the birds after mating, which business is generally conducted in a quiet and unostentatious manner, repair to the woods or hedges in quest of a suitable shrub or tree in which to establish a home. This matter requires considerable labor and care; and, ordinarily, no little time is devoted thereto.

The place usually selected, is a retired and unfrequented thicket or nook; or occasionally, an orchard in close proximity to an occupied dwelling. When the former, the cedar, with its tall, nearly vertical branches and dark green foliage, is, of all our forest-trees, pre-eminently fitted to receive, support, and conceal the nest; when the latter, the apple is accorded the preference.

Having chosen the locality, the birds waste no time in idleness, but apply themselves to the task of building, with the most commendable zeal and perseverance. Each bird has its allotted part of the work to perform: the duty of the male being to collect the materials; that of the female, to shape and fix them in their proper places. Occasionally the latter, when not thus occupied, accompanies her partner in his frequent journeys, and assists in collecting and bringing in his load. The time employed in the labor of construction, making due allowances for recreation and rest, is between five and six days.

In form, the typical structure is nearly hemispherical, and presents a rather neat and elegant appearance. It is compactly made, and, in the generality of instances, exhibits anything but bulkiness. In position, it rests upon the horizontal limb of a tree, or is wedged in among several upward-growing branchlets, at elevations varying from three to twenty feet.

During the period of nidification, almost any substance, having the requisite flexibility and strength, is in demand; consequently, the materials of composition are as varied as they are numerous, and depend in a great measure upon the environment. In thickets, small twigs, stems of grasses, dried leaves, lichens, and the tendrils of the vine, make up the bulk of the structure; but in places situated in close proximity to houses, wrapping-twine, strips of rags, and such other substances as are ready prepared and accessible, are utilized. The lining is generally fine roots of grasses, bits of string, flower-stalks, lichens and tendrils. The cavity seldom exceeds three inches in width, and scarcely two and a half in depth; while the external diameter varies from four and a half inches to five; and the height, from two and a half to three.

The specimen which we have figured, and which may be regarded as typical in its character, was obtained in the vicinity of Bridgeton, N. J., in the summer of 1878, and was neatly erected upon the horizontal branch of an oak, and held in position by two nearly vertical branches of the same tree. It was placed at a height of nearly twenty feet above the ground, and consists almost exclusively of fibres of the long greenish-yellow lichens which constitute so conspicuous a feature of the trees of that locality, in their sylvan retreats. Externally, besides a few fine rootlets, there is noticeable much white wrapping-string, which relieves, in a great degree, the monotony of the fabric. Internally, there is the same green moss-like lichen. The cavity is beautifully symmetrical, and measures about three inches in width, and nearly two inches in depth. The external diameter is five inches, and the height, two inches. The nest is most elaborately finished, and is evidently the workmanship of superior mechanics. The Plate represents it three-fourths the natural size, placed upon an apple branch.

Among other fabrics which the writer possesses, is one which was obtained in June, 1871, in Germantown, Pa., saddled upon the horizontal branch of an apple-tree. It is rather firmly and compactly built, and is composed, exteriorly, of stems of the common timothy, fine rootlets, dried leaves of the mullein, and green leaves of the apple, which are held together by broad strips of colored rags, bits of lint, and divers strings, the latter constituting a prominent feature. Interiorly, there is a promiscuous lining of flower-bearing stems, fragments of strings, fine roots of grasses, fibres of linen, and tendrils of some species of cucurbitaceous plant. The nest is about four and a half inches in external diameter, and nearly three in height. The cavity is three inches wide, and two and a half inches deep in the middle.

This last model of architecture, as already remarked, was placed upon the limb of an apple-tree, near its extremity, and barely at a distance of fifteen paces from an occupied dwelling. The rags, etc., which form such a prominent feature of the outside, were purposely furnished by an inmate of the house. When first proffered, it was thought that the birds would be slow to perceive the use to which they could be put, but not so, for they entered into the idea with the most praiseworthy alacrity. And even after the materials were no longer supplied, they would repeatedly fly to the bush upon which they had been laid, as though soliciting a continuance of such favors.

The birds having constructed their home, the female commences on the day following its completion to deposit her complement of eggs. The time thus spent varies from four to six days, and depends upon the number which is to constitute a setting. Oviposition being accomplished, incubation follows, sometimes immediately on the deposit of the last egg, but, not generally, until the succeeding day. This is the exclusive task of the female for nearly fourteen consecutive days. Although the male does not assist in the labor, yet he shows himself to be a very kind and attentive husband, by providing food for his partner, and keeping a vigilant lookout for approaching enemies. This he signals by a low single note, which the female quickly acknowledges, and instantly the two timid creatures beat a hasty retreat to an adjoining tree or shrub beyond the reach of peril, where they become passive spectators of the demolishment of their home, with all its precious burden.

The eggs, which are from four to six in number, resemble those of the Waxwing, but differ in size, being somewhat smaller. Their groundcolor passes from a light slate to a dark stone-color. The markings are chiefly blotches of dark purplish-brown, lighter shades of the same color, and peuumbræ of light purple, either by themselves, or surrounding the darker spots. In form, they are either oblong-oval, or nearly spherical; and in length, they vary from .80 to .90 of an inch, and in breadth, from .50 to .70 of an inch.