The winter plumage of this species differs so greatly from that of summer, that I have been induced to present you with a figure of the bird in both states. It is difficult to perceive any external difference between the sexes, only the males are rather larger than the females. Their flesh, although black and tough, is not very unpalatable.
The trachea is flattened, with numerous close, transparent rings. The gullet, as in all the other species of this genus, is very dilatable. The gizzard, which is small, has its inner membrane thin and of a yellow colour. The intestines are about the thickness of a goose quill, and measure two feet eight inches in length.
Uria Grylle, Lath. Ind. Ornith. vol. ii. p. 797.—Ch. Bonaparte, Synops. of Birds of the United States, p. 423.—Swains. and Richards. Fauna Boreali-Americana, part ii. p. 478.
Black Guillemot, Nuttall, Manual, vol. ii. p. 523.
Adult in Summer. Plate CCXIX. Fig. 1.
Bill shorter than the head, straight, rather stout, tapering, compressed, acute. Upper mandible with the dorsal line nearly straight and sloping, towards the tip slightly arched, the sides sloping and towards the end a little convex, the edges sharp and slightly inflected. Nostrils basal, lateral, linear, partially concealed by the feathers. Lower mandible with the angle long and very narrow, the dorsal line ascending, straight, the sides sloping upwards, slightly convex, flat at the base, the edges sharp and inflected, the tip acute.
Head of moderate size, oblong; neck short; body full, depressed; wings rather small. Feet placed far behind, short, of moderate size; tarsus short, compressed, anteriorly scutellate, laterally covered with reticulated angular scales; toes rather slender, scutellate above, connected by entire reticulated webs, the outer and inner with a small marginal membrane; the first toe wanting, the third and fourth about equal, the second shortest; claws small, arched, compressed, rather obtuse, that of the middle toe with a dilated thin inner edge.
Plumage soft, close, blended and velvety; feathers of the head very short, on the back broadly rounded, of the lower parts more elongated. Wings rather small; primary quills curved, the first longest, the second little shorter, the rest rather rapidly diminishing; secondary incurved, broadly rounded. Tail short, narrow, rounded, of twelve rather pointed feathers.
Bill black, inside of mouth vermilion tinged with carmine. Iris deep brown. Feet of the same colour as the mouth, claws black. The general colour of the plumage is deep black, on the upper part tinged with green, on the lower with red, there being only a large patch on each wing, including the secondary coverts and some of the smaller feathers pure white, as are the lower wing-coverts. The quills and tail are tinged with brown.
Length to end of tail 13 7/8 inches, to end of claws 16 1/4, to end of wings 13; extent of wings 21 1/2; wing from flexure 6 1/2, tail 2; bill along the ridge 1 1/4, along the gape 1 7/8; tarsus 1 2/12, middle toe 1 1/2, its claw 3/8. Weight 13 1/2 oz.