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 is observable that the legs of this bird are so constructed and situated as to render it incapable of walking upon them. When the bird quitted the water, it shoved its body along upon the ground like a seal, by jerks, rubbing the breast against the earth; and returned to the land in a similar manner. In swimming and diving, the legs only are used and not the wings, as in the Guillemot and Auk tribes; and by their situation so far behind and their little deviation from the line of the body, it is enabled to propel itself in the water with great velocity in a straight line, as well as turn with astonishing quickness." The plumage of the Northern Diver is close, and its skin tough, on which account it is much used by the inhabitants of northern countries in the manufacture of comfortable articles of clothing. The flesh is hard and of a rank fishy flavour.

THE BLACK-THROATED DIVER.

The (Colymbus arcticus) is smaller than the preceding species, but very much like it both in the colour and markings of its plumage. In its nuptial costume the upper part of the head and hind neck are deep ashy grey, the back and wings black, a space upon the back and another upon the hinder part of the wing are spotted with white, while upon the fore part of the wing is another space speckled with blue spots. The side of the neck presents a longitudinal black streak, the fore neck has a transverse white band, and the sides are longitudinally marked with black. The under side is white. During the winter, the head and nape are grey, the rest of the feathers on the upper surface black with white borders; the lower parts of the body are white, and the sides of the crop striped black and white. In young birds the latter markings are wanting. The eye is light brown, and the beak black. The foot is grey at its exterior, and flesh-red on the inner side. This species is from twenty-eight to thirty inches long and from fifty to fifty-two broad; the wing measures from fourteen to fifteen inches, and the tail from two inches and a quarter to two inches and a half. The Black-throated Diver is rare on our southern coasts; on the northern shores of our island it begins to appear about September. The majority of these depart about April, although a few remain to nest in the northern parts and islands of Scotland. We are indebted to Mr. Selby for the following account of its breeding, as observed by himself during the course of an excursion in Scotland.

"This beautiful species, whose breeding station has never before been detected, we found upon most of the interior Sutherland lochs. The first we noticed was at the foot of Loch Shin, where we were so fortunate as to find the nest, or rather the two eggs upon the bare ground of a small islet, removed about ten or twelve feet from the water's edge. The female was seen in the act of incubation, sitting horizontally, and not in an upright position, on the eggs. In plumage she resembled the male, and when fired at immediately swam or rather dived off to a short distance. Our pursuit after them was, however, ineffectual, though persevered in for a long time, as it was impossible to calculate where they were likely to rise after diving. Submersion frequently continued for nearly two minutes at a time, and they generally reappeared at about a quarter of a mile's distance from the spot where they had gone down. In no instance have I ever seen them attempt to escape by taking wing. I may observe that a visible track from the water to the eggs was left by the female, whose progress upon land is effected by shuffling along upon her belly, propelled by her legs behind. On the day following (May 31st) Mr. J. Wilson was fortunate enough to find two newly-hatched young ones in a small creek of Loch Craigie, about two miles and a half from Lairg. After handling and examining them, during which the old birds approached very near to him, he left them in the same spot. Accordingly, on the Monday morning we had the boat conveyed to the loch, and on our arrival soon descried the two old birds, attended by their young and apparently moving to a different part of the loch. Contrary to their usual habit at other times,