Читать книгу Bird Portraits - Эрнест Сетон-Томпсон, Seton Ernest Thompson - Страница 2

After a severe winter, while snow and ice still remind us of the past, the Song Sparrow, mounting to the top of some bush or small tree, repeats his cheerful tinkling song, "helping," as Thoreau says, "to crack the ice" in the ponds. Few people are so unobservant as not to notice this bright strain, after the silence of winter. A peculiarity of the song is the amount of variation shown by different individuals and often by the same bird. At almost regular distances along the bushy roadside, or over the hedge-intersected fields, one will meet on the early spring mornings one Song Sparrow after another, each restricted to his part of the road or field. If one notices the songs of each, it is evident that, though the songs have the same general character, there are almost as many ways of beginning a strain as there are singers. Moreover, the same bird has been observed to alter his song in a short space of time to two or three different variations. Probably, if one's ear were acute enough, all birds of one species would be found to sing with slight differences, but few show in so marked a degree as the Song Sparrow the tendency to variation which characterizes a species.

In early April, the Song Sparrow builds a nest of grass, either on the ground beneath a tuft of grass, or under some brambles, or less frequently a few feet above the ground, in a bush or on the lower limbs of a tree. In the latter situation, twigs are of course necessary for the support of the structure. Here again the bird shows a tendency to vary in its habits. The eggs are from four to five in number, greenish white, thickly marked with shades of brown, lavender, or purple. Sometimes an egg is found in the nest much larger than the others; this has been laid by the lazy Cowbird. As the large egg receives most warmth and hatches first, the young Cowbird soon crowds out the rightful occupants of the nest, and the parent Song Sparrows will be seen later, working busily to feed a great homely youngster as large as themselves, who will afterwards go off to join a flock of his own kind. Probably every Cowbird has been reared at the expense of a brood of some small bird, Sparrow, Warbler, or Vireo.

In June, the young Song Sparrows are able to take care of themselves, and the energetic parents build another nest and rear another brood. The brooding time is the chief period of song, so that birds that breed twice sing later in the summer than others. The Song Sparrow's little strain may be heard well into August; but toward the end of that month we hear from the cornfields and gardens a curious, husky warble, unlike the bright spring carol of the Song Sparrow, but nevertheless made by that bird. In the fall, and even during the winter, a warm bright day will occasionally induce a Song Sparrow to sing his lively spring song, so that where the Song Sparrow winters, the strain may be heard every month of the year.

In the late summer and fall, the neglected corners of gardens and fields, where the seeds of weeds and grasses offer an abundance of food, are the favorite resort of the sparrows. The Song Sparrow may be distinguished from most of its relatives by its streaked breast, in the middle of which the spots generally form a conspicuous blotch, and by its long tail, which it constantly jerks as it flies. The Song Sparrow is very retiring, and when alarmed, slips into brush heaps or bushes, where it hides as skillfully as a mouse.