Bill long, slender, compressed, tapering, slightly recurved. Upper mandible with the dorsal line very slightly curved upwards, the ridge convex, the sides grooved nearly to the middle, afterwards convex, the edges inflected and directly meeting those of the lower mandible, the tip narrowed and slightly deflected. Nostrils basal, linear, pervious, nearer the edge than the dorsal line. Lower mandible with the angle very narrow and medial, beyond it the outline straight and ascending, the sides grooved as far as the angle and convex, the edges sharp and inflected, the point very narrow.
Head small, oblong, narrowed before. Neck rather long, slender. Body slender. Feet long and slender; tibia bare for half its length, scutellate before and behind; tarsus long, slender, covered before and behind with numerous scutella, the narrow lateral spaces with extremely small oblong scales. Toes small, very slender, scutellate above, flat beneath, marginate, the middle toe connected with the outer by a basal membrane, with the inner by an extremely small one; first toe extremely small, second slightly shorter than fourth, third considerably longer. Claws small, compressed, arched, rather obtuse, that of third toe with a dilated inner edge.
Plumage soft and blended, on the fore part of the head very short, on the neck short and almost downy. Wings rather long, very acute, narrow; primaries tapering and rounded, the first longest, the second little shorter, the rest rapidly graduated; secondaries obliquely rounded, the inner elongated and tapering. Tail short, of twelve narrow, rounded feathers, the two middle ones considerably longer than the rest.
Bill dusky-green, black at the end. Iris brown. Feet dull greenish-grey. A broad band from the bill to the eye, all the lower parts, as well as the back, excepting a small portion anteriorly, pure white; that colour, however, does not appear on the back, when the wings are closed, it being covered over by the scapulars. Loral space white, marked with small oblong spots of greyish brown; sides of the lower part of fore neck and a portion of the breast faintly barred with grey. The upper part of the head, and the hind part and sides of the neck are greyish-white, with longitudinal central greyish-brown markings. The scapulars and inner secondaries are greyish-brown, the feathers edged with greyish-white, and lined or mottled with dark brown towards the margins; the smaller wing-coverts plain, the larger darker near the edge and margined with whitish, as are the outer secondaries; the primary quills and their coverts dark brown, the shaft of the outer white. The tail is greyish-white, undulated with light brown, the four outer feathers on each side with only a series of spots on the outer edge, which on the outermost feathers is almost obliterated.
Length to end of tail 11 inches, to end of wings 12; wing from flexure 7; tail 3; bill along the back 2 2/12, along the edge of lower mandible 2 2/12; bare part of tibia 1 5/12; tarsus 2 5/12; middle toe 1 2/12, its claw 5/12.
WILSON’S PETREL.
Thalassidroma Wilsonii.
PLATE CCLXX. Male and Female.
A long voyage would always be to me a continued source of suffering, were I restrained from gazing on the vast expanse of the waters, and on the ever-pleasing inhabitants of the air that now and then appear in the ship’s wake. The slightest motion of the vessel effectually prevents me from enjoying the mirth of my fellow passengers, or sympathizing with them in their sickness. When the first glimpse of day appears, I make my way on deck, where I stand not unlike a newly hatched bird, tottering on feeble legs. Let the wind blow high or not, I care little which, provided it waft me toward the shores of America. If the sky be clear, the first sight of the sun excites emotions of gratitude towards the Being by whose power it was formed, and sent forth to shed its benign influence on surrounding worlds. Silent adoration occupies my soul, and I conclude with ardent wishes for the happiness of friends left far behind, and those toward whom I am proceeding. But now, ever flapping its winglets, I have marked the little bird, dusky all over save a single spot, the whiteness of which contrasts with the dark hue of the waters and the deep tone of the clear sky. Full of life and joy it moves to and fro, advances toward the ship, then shoots far away, gambols over the swelling waves, dives into their hollows, and twitters with delight as it perceives an object that will alleviate its hunger. Never fatigued, the tiny Petrels seldom alight, although at times their frail legs and feet seem to touch the crest of the foaming wave. I love to give every creature all the pleasure I can confer upon it, and towards the little things I cast over the stern such objects as I know they will most prize. Social creatures! would that all were as innocent as you! There are no bickerings, no jealousies among you; the first that comes is first served; it is all the result of chance; and thus you pass your lives. But the clouds gather, the gale approaches, and our gallant bark is trimmed. Darkness spreads over the heavens, and the deep waters send back a blacker gloom, broken at intervals by the glimmer of the spray. You meet the blast, and your little wings bear you up against it for a while; but you cannot encounter the full force of the tempest; and now you have all come close beneath me, where you glide over the curling eddies caused by the motion of the rudder. You shall have all possible attention paid you, and I will crawl to the camboose, in search of food to support your tiny frames in this hour of need. But at length, night closes around, and I bid you farewell.
The gale is over; the clear blue of the sky looks clearer than ever, the sun’s rays are brighter, on the quiet waters the ship seems to settle in repose, and her wings, though widely spread, no longer swell with the breeze. At a distance around us the dusky wanderers are enjoying the bright morning; the rudder-fish, yesterday so lively, has ended its career, so violently was it beaten by the waves against the vessel; and now the Petrels gather around it, as it floats on the surface. Various other matters they find; here a small crab, there the fragments of a sea-plant. Low over the deep they range, and now with little steps run on the waters. Few are their notes, but great their pleasure, at this moment. It is needless for me to feed them now, and therefore I will return to my task.
It would be extremely difficult for any individual to determine the extent of the movements of the three species of Petrel seen on the waters of the Atlantic. My opinion is that until their breeding places are repeatedly visited by naturalists, little can be known respecting the range of their flight. I have crossed the ocean many times, and have always paid more or less attention to these birds; yet I am as ignorant of their migrations as my predecessors. I have rarely seen Wilson’s Petrel farther to the eastward than the Azores, and beyond these islands it generally abandoned the vessel. Along the American coast, I have not met with it to the northward beyond the 51st degree of latitude; while to the southward I have rarely observed many on the Gulf of Mexico; nor do I believe that any breed on the shores of the Floridas, or on the Bahama Islands, as alleged by Wilson, who, it would appear, stated so from report. Petrels are rarely destroyed by men, quadrupeds, or rapacious birds, when breeding; to the former they are of no value as an article of food, and by the latter they are seldom sought after; consequently they are more likely to return to their breeding places than most other birds, many of which are frequently induced to abandon them on account of the persecutions to which they are subjected. I have found the Forked-tailed Petrel breeding on our coast, in the fissures of rocks above the reach of the spray, and Wilson’s digging for itself burrows in the sand or loose earth, on low islands. The Thalassidroma pelagica I have never found breeding on any part of our coast; but it is well known that it resorts to holes on certain of the Shetland Islands, among the blocks and stones of which the beaches are formed; though it appears that in some spots, where the fisherman are in the habit of destroying them, many resort to the elevated fissures of the rocks, where also a few of the Forked-tailed species occasionally breed. The latter then, though more abundant in America, belongs to Europe also. Wilson was not aware that the species now named after him was any thing else than “the Stormy Petrel, Procellaria pelagica of Linnæus;” and he remarks that it “is found over the whole Atlantic ocean, from Europe to North America, at all distances from land, and in all weathers.”