Cassell's book of birds; vol. 4

by Alfred Edmund Brehm

The MERGANSERS, or GOOSANDERS (Mergi), are distinguishable by their very elongate body, moderately long, thin neck, and large head, which is generally ornamented by a tuft or hood; their bill is long, straight, or slightly arched, slender, and almost cylindrical; its callous margins are sharp and strongly denticulated, and its tip terminated by a strong hook; the legs are short, and placed very far backwards, the feet large, and toes long; the hind toe is furnished with a supplementary web, resembling that of some of the Divers. The wings are of moderate length, and very acutely pointed, the first and second quills being the longest; the tail, which consists of sixteen or eighteen feathers, is short, broad, and rounded; the plumage is short, thick, and prettily coloured, but the colours vary at different ages, and also in the sexes as well as at different seasons of the year. These remarkable birds walk badly, with a vacillating waddling gait, keeping their bodies erect, but they are excellent swimmers, and dive with wonderful facility. Their flight is rapid, light, and somewhat resembles that of the Duck. When Mergansers fly in company, as they frequently do, they range themselves in a certain regular order; they rise readily, but with a loud noise, splashing with their feet upon the water, and when they alight again in that element, fly obliquely downwards, and either at once dive or stop themselves by means of their outstretched tail. All the members of this family belong to the northern regions of our globe, but are met with pretty equally both in the eastern and western hemispheres. When driven south by the intensity of the cold, their migrations sometimes extend to the south of Europe, and to corresponding latitudes in Central Asia and America. The Goosanders subsist chiefly upon fishes, crustaceans, worms, and insects; the fishes they obtain by diving, and chasing them through the water, exactly after the manner of the true Divers. These birds are strictly monogamous, and construct their nests sometimes upon the ground, in clumps of herbage, among reeds, in hollow trunks, or amongst the branches of trees, and occasionally in the deserted homes of other birds. The nest is inartistically formed of dried stalks, leaves, moss, and rushes, warmly lined with down. The brood consists of from seven to fourteen unspotted grey or greenish white eggs. The female alone broods, sitting for a period of from twenty-two to twenty-four days, the male always taking up a position in the neighbourhood of his mate. At first he seems to take some interest in his young brood, but soon forsakes them, and joining company with others of his own sex, retires from his family cares in order to undergo his autumnal moult. The flesh of the Goosanders is disagreeable, and of an oily taste, but they are often killed for the sake of their down and feathers. The eggs are in much request.

THE WHITE-HEADED GOOSANDER.

The WHITE-HEADED GOOSANDER (Mergellus albellus) has been made the representative of a distinct sub-family, probably on account of the shortness and breadth of its bill, and the peculiarities in its mode of life. This bird bears a great resemblance to some of the Divers, and therefore must be placed near them.

The summer dress of the male is pure white, a spot between the eyes, the beak, and a band across the nape are blackish green; the back and a portion of the wings, two small stripes upon the shoulder, and a long stripe above the wing are black; the sides are blueish grey, cross-waved with black; the primary quills blackish brown, and the tail-feathers grey; the eye is blueish grey, the beak[Pg 171] and foot greyish blue. The length is nineteen inches, the breadth thirty inches; the length of wing eight inches and a half, and the length of tail three inches. In the female, which is smaller than her mate, the head and hinder neck are brown, the bridles black, the throat and under part of the body white, the feathers of the mantle grey, the upper breast and sides whitish, transversely waved with black. After the summer moult the dress of the male very much resembles that of the female. The real habitat of the White-headed or Dwarf Goosander, as it is sometimes called, seems to be in Northern Asia, from whence it extends westward into Northern Europe, and eastwardly into the northern parts of America. During the winter months, however, it wanders far southward. It is then to be met with in considerable numbers throughout the whole of China, being more especially abundant in the northern provinces of the Celestial Empire. It is, moreover, a regular visitant to Northern India, and is not unfrequently seen in Central and in Southern Europe. It seems to be more scarce in the Southern Provinces of the United States of North America, for Audubon informs us that in the western division, at least, it was a bird of unusual occurrence. In very hard winters it makes its appearance in Germany, as early as the month of November, but more usually not until the middle of December, returning again to the north in February or March. It is likewise a winter visitor to the shores of Great Britain, large numbers being sometimes seen on the eastern or southern coasts of England. It is rarely found north of the Humber, and is comparatively rare in Scotland and Ireland. In some parts of Switzerland it may be met with even so late as the beginning of May. This species is generally only to be found in the neighbourhood of fresh-water lakes, sometimes, but only casually, it may be seen in quiet bays upon the sea-coast, more especially in such as are at the mouths of rivers. Unlike the Divers, it seems to prefer flowing streams to stagnant water, and often wanders along the course of rivers, from which it only makes excursions to such lakes and ponds as may be free from ice. When walking, the Dwarf Goosander holds its body in a horizontal position, with its head retracted; it walks with a waddling gait, but better than the generality of its near allies. When swimming it keeps itself about half submerged, and when it dives it stretches itself out to its full length, and disappears in an instant. Its flight, which very much resembles that of the smaller Ducks, is rapid, straight, accompanied by a slight whirring of the wings, and is generally but little elevated above the surface of the ground or of the water. It is remarkably lively in its disposition, and even during the bitterest cold weather is sprightly and active.

These birds may generally be recognised by the manner of their diving; the True Divers, after their plunge, generally reappear close to the spot where they went down, but the Goosanders swim while under water to a considerable distance, shooting along like a pike or a trout, and as they can keep submerged for a minute at a time, it is not easy to calculate where they will come up again. They live principally upon small fishes, crustaceans, and aquatic insects, and in confinement, at least, do not refuse vegetables; they will also eat bread greedily. In catching fishes they are quite as skilful as the larger Divers, and it is very interesting to watch a flock of them thus employed. Now you see them swimming altogether; in a moment they all vanish at once, and the water becomes disturbed by their movements underneath; at length they come up again one after another, but widely separated, and often from thirty to fifty yards from the place where they went down. Again they congregate, and anon they dive again; some of them coming up perhaps close to the shore. Sometimes they are obliged to procure their food through small holes in the ice, often not a foot square, and to pursue their game beneath the frozen surface, only presenting themselves every now and then at the aperture for a supply of air. Their power of seeing under the water must therefore be very good, or they would never be able to find the broken place at which to emerge. Where the supply of food is scanty they will rake up the bottoms of ponds, in search of frogs or insects. The habit of diving all at once is peculiar to the Goosanders, and the explanation of this manœuvre[Pg 172] seems to be that by so doing they come among the astonished fishes in all directions, thus enabling one bird to catch those that are trying to escape from another; but we have never seen them, as some writers assert, arrange themselves in the form of a crescent, so as to drive the fishes, as it were, into a narrow space. About the breeding of these birds we are very imperfectly informed; we know, however, that in the north of Russia they assemble in great numbers, and build their nests upon the shore, or upon small islands, sometimes in hollow trees. We know, likewise, that their nest is composed of dry broom (Genista) and grasses, lined with feathers, and that their eggs, eight to twelve in number, are of a dirty white, or greenish brown colour, but we are ignorant either of the duration of their incubation, or of the manner in which they educate their progeny.

THE GREEN-HEADED GOOSANDER.

The GREEN-HEADED GOOSANDER (Mergus merganser) differs from the preceding species not only in its greater size, but in the structure of its bill, which is elongated and compressed at its sides. In his summer dress the male is blackish green upon the head and upper neck; the upper back, shoulders, and margins of the wings are black; the whole under surface and the upper wing-covers are of a beautiful yellowish red; the wing-spot is white. The wing-quills are black, the lower tail-covers grey, finely marked with black, and the tail-feathers grey. The eye is reddish yellow, beak coral-red, and foot pale red. The female has the upper head and nape brown, the back-feathers blueish grey, the under surface of her body and the wing-spot white; the fore parts of her breast and sides are grey, marked with a darker and a lighter shade. After the summer moult the plumage of the male is very similar to that of the female, but somewhat more beautiful. The length of this species is from thirty to thirty-two inches; breadth, forty to forty-two inches; length of wing, twelve inches; length of tail, three inches.

The Green-headed Goosander inhabits the northern parts of Europe, Asia, and America, being pretty equally distributed in all these continents: its migrations, which occur with much greater regularity than those of the Mergellus albellus, extend, on the one hand, to all the southern countries of Europe, the south of China, and north of India; and on the other, to the extreme south provinces of the United States. A few pairs are occasionally known to breed in the Orkneys and Hebrides, but with us by far the greater number only arrive from the north about the end of November, and return thither in February. The Green-headed Goosander may justly be regarded as one of the most beautiful of aquatic birds. With the exception of a few hours at noon, he is invariably to be seen in the water. Upon dry land his gait is waddling, and his flight, although rapid, laboured and heavy; but upon the sea he is quite at home. When swimming quietly upon the surface he rows himself along with powerful but slowly-repeated strokes of his broad feet, passing through the water with tolerable velocity. Should he, however, cast an envious eye upon some other bird that has caught and is about to swallow a fish he would fain appropriate, he rushes in pursuit with truly wonderful rapidity. In diving he is equally adroit, plunging suddenly down without the least sound or commotion, and in clear water, where his career, as he steers his course half way between the surface and the bottom can be observed, his rapid progress seems rather to resemble the movements of a trout than those of a bird. On occasions he can remain under water for two minutes at a time; generally, however, he comes up in about a minute, and in this short period, notwithstanding all the ins and outs of his zigzag course, will have dived, as shown by the place of his reappearance, upwards of 100 yards. As long as these birds can obtain a sufficient supply, they subsist exclusively upon fishes, preferring such as are about five or six inches long, although they are well able to vanquish and swallow those of much larger size. The breeding-place of these Goosanders is generally in latitudes very far north, their usual resort being to the Danish islands, and even still farther north.[Pg 173] Their period of incubation commences about the beginning of June. The nest is constructed in various situations, often in some excavation in the ground, hidden between stones or bushes, on the tops of pollard willows, on the lofty eyries of birds of prey, in the deserted nests of Crows, or within the cavities of hollow trees. At Jana-Elf we saw large chests, resembling dove-cots, upon all the tallest trees; these we were told were intended specially to induce the Goosanders to build their nests, and lay their eggs in them. These breeding-boxes are likewise in common use among the Lapps and Finns, and, as we learned, were regularly visited by the breeding birds.

THE GREEN-HEADED GOOSANDER (Mergus merganser).