On the Columbia River they were not resident, arriving there in October, continuing throughout the winter, and leaving early in May. During their stay they moved through the forest in small flocks, frequenting low trees, and for the most part keeping perfect silence. They were timorous and difficult of approach.
Its habits are said to resemble those of the robin, but in some of them the descriptions given appear to correspond more with those of the Fieldfares and Redwings of Europe. Like those species it is a summer resident of high northern latitudes, affects secluded forests and thickets bordering upon streams, and is found only in unfrequented localities.
Dr. Cooper was of the opinion that a few of these thrushes remained in Washington Territory throughout the summer, as he frequently met with them in the dark spruce forests of that region as late as June and July. He describes the song as consisting of five or six notes in a minor key, and in a scale regularly descending. It was heard continually throughout the summer, among the tops of the trees, but only in the densest forests. Dr. Suckley states that after a fall of snow they would be found along the sandy beaches near the salt water, where they were both abundant and tame. We are indebted to Mr. W. H. Dall for our first authentic knowledge of its nest and eggs. The former measures 6 inches in diameter with a depth of 2½ inches. It has but a very slight depression, apparently not more than half an inch in depth. The original shape of the nest had, however, been somewhat flattened in transportation. The materials of which it was composed were fine dry mosses and lichens impacted together, intermingled with fragments of dry stems of grasses.
A nest of this thrush obtained by Dr. Minor, in Alaska, is a much more finished structure. Its base and periphery are composed of an elaborate basket-work of slender twigs. Within these is an inner nest consisting of an interweaving of fine dry grasses and long gray lichens.
The eggs in size, shape, ground color, and markings are not distinguishable from those of the Turdus musicus of Europe. They measure 1.13 inches in length by .80 in breadth, are of a light blue with a greenish shading, almost exactly similar to the ground color of the T. migratorius. They are very distinctly marked and spotted with a dark umber-brown approaching almost to blackness.
Mr. Dall informs us that the nest found by him was built in a willow bush, about two feet from the ground, and on the top of a large mass of rubbish lodged there by some previous inundation. Other nests of the
same species were met with in several places between Fort Yukon and Nulato, always on or near a river-bank and in low and secluded localities.
They arrive at Nulato about May 15, and prefer the vicinity of water, frequenting the banks of small streams in retired places. Mr. Dall states that he has seen the male bird on a prostrate log near the nest, singing with all his might, suddenly cease and run up and down the log for a few minutes, strutting in a singular manner, then stopping and singing again; and keeping up this curious performance. Specimens were received from Sitka, Kodiak, Cook’s Inlet and Admiralty Islands.
Subfamily MIMINÆ.
Birds of this section have a somewhat thrush-like appearance, but (except in Oreoscoptes) with longer, much more graduated, and broader tail; short concave wings, about equal to or shorter than the tail, usually lengthened, sometimes decurved bill without notch, and strongly marked scutellæ on the anterior face of the tarsus. The loral feathers are soft, and not ending in bristly points. The colors are dull shades of brown, gray, or plumbeous. Most of the species, in addition to a melodious native song, possess the power of imitating the notes of other birds; sometimes, as in the American Mocking Bird, to an eminent degree. All are peculiar to the New World, and the species are much less vagrant than those of the Turdinæ,—those of the United States scarcely going beyond its northern boundary; others, again, restricted to small islands in the West Indies or in the Pacific Ocean.