Part 35

It is these daily movements of Duck that are known to sportsmen as "flights," and they afford excellent shooting to the gunner concealed on their route. Vast numbers of this and other species of Duck used formerly to be taken in decoys, but partly owing to decrease in the numbers of the fowl, or still more to the increase of shooters, who frighten them away, few if any decoys are now worked at a profit in this country. A decoy is a pond in a suitable locality near the sea surrounded by trees and having two or four curved arms known as "pipes" running up at the different corners. These pipes are covered with netting, and end in a small bag net. The Duck are enticed up by tame birds and by means of a red dog that they follow out of curiosity. When some way up the pipe they see behind them the decoyman, who has hitherto been concealed by an ingenious arrangement of reed-screens, and rather than turn back and face him, they rise and fly up the pipe into the net. The whole operation must be carried out in silence so as not to scare the other birds on the pond, who remain in complete ignorance of their comrades' fate. Absolute quiet and plenty of food are the essentials for the successful working of a decoy. They are still used in Holland, where they form a considerable source of profit to their owners; their number is limited, and a licence has to be paid for each decoy.

After the brood can fly the Duck loses her primaries and becomes incapable of flight for a short time, but as soon as her quills are grown the whole family move off to join the flocks, which are now rapidly forming. Large numbers visit us yearly from abroad, and a spell of severe weather in midwinter still further increases their numbers.

The male has a glossy green head and neck, the latter being encircled by a narrow white ring; rump and tail coverts glossy greenish black, the four central coverts upturned; chest and breast deep chestnut; rest of under parts pale grey, vermiculated with black; bill greenish yellow; legs orange. The Duck is dark brown, the feathers having paler edgings. The young resemble the female, but the males have assumed their full dress by October. The male in eclipse has a plumage which approximates to that of the female. Length 23 in.; wing 11 in.

THE GADWALL Anas strepera, Linnæus

The Gadwall is a scarce visitor to our shores, occurring irregularly along the east coasts of Scotland and England, but it is very rarely seen in the west or in Ireland. In a few places in Norfolk, where it was originally introduced, it breeds, and has of late years considerably increased both there and in the surrounding counties. In habits it resembles the Mallard. The eggs are usually ten in number and of a delicate creamy pink. It may be easily recognised on the wing by its white speculum.

On the Continent it nests in Central and Eastern Europe, its breeding range extending to the far north of Russia. It winters in the Mediterranean basin.

The adult male is greyish brown, with darker mottlings on the head and neck; back dark brown, with greyish markings; median wing coverts chestnut; greater coverts almost black. Under parts white, grey on the flanks and vent. Under tail coverts black. The female is marked with dark brown and buff much like a Wild Duck, but is recognisable by the white speculum. The young somewhat resemble the female. The white speculum forms a distinctive mark of this species at all ages. Length 20 in.; wing 10·5 in.

THE SHOVELLER Spatula clypeata (Linnæus)

This bird is by no means rare with us in winter, when large numbers come over from abroad. It is essentially an inland species, preferring small and sheltered pieces of water rather than wide open stretches. Its most characteristic feature is the large flattened bill with which it feeds on the surface-swimming animalculæ and other insects, the broad lamellæ of the mandibles forming an efficient strainer. When feeding three or four will often follow each other in a circle, each feeding in the other's wake. Of late years it has become more numerous as a breeding bird, and it now nests commonly in the Broads and other districts of Norfolk and the eastern counties. In Kent and the Midlands, Yorkshire and the North, it nests sparingly, as well as in some of the southern and eastern counties of Scotland. In Ireland it is a local but by no means scarce species. Except in the breeding season it is a very silent bird; when courting it moves its head up and down, uttering a low "took, took," which is answered by the female. The nest is generally placed at some distance from the water in the middle of a dry grass-field, where there is hardly any cover beyond a small patch of grass more luxuriant than the rest.

The eggs, which number from eight to ten, are pale greenish buff in colour. The female sits very closely, and the male remains in attendance at no great distance and accompanies her when she comes off to feed. The incubation period of this species is rather shorter than with most Ducks, and lasts between twenty-one and twenty-three days. The young are solely looked after by the Duck, and when first hatched their bills show no trace of the broadening and flattening, characteristic of the adult.

During the summer the Drake assumes an "eclipse" plumage, which somewhat resembles that of the Duck. In October he begins, unlike most other species, to assume an "intermediate" plumage, in which the head is very dark but not metallic, and the white of the breast is obscured by dark transverse bars. The full plumage is not usually complete till the end of February or early in March.

In this country our breeding birds are practically resident, only shifting from their nesting-quarters when frozen out. The majority of birds met with, however, in winter are immigrants from the Continent, who leave us again in March.

The adult Drake in full plumage is a beautiful bird. The head and upper neck are metallic green; lower neck, breast, and scapulars white; back brown; shoulders pale blue; greater wing coverts white. The under parts are deep chestnut; speculum green; bill black; legs orange.

The Duck is dark brown, with light rufous buff edgings to the feathers. Shoulders bluish. The young at first resemble the Duck, and in November begin to assume the "intermediate" plumage described above, except that the breast feathers are spotted and not barred. It does not always assume its full plumage in the first year.

THE PINTAIL Dafila acuta (Linnæus)

This species visits us in large numbers during the winter, arriving in September and not leaving our shores till April. During this period it is essentially a Sea-Duck, haunting shallow shores and estuaries, where it feeds on aquatic vegetation, crustacea, and other animal life brought in by each tide. It is commoner on the east coast than elsewhere owing to the large tracts of shore suited to its habits, but it may be found in smaller numbers on the west and in Ireland, wherever suitable localities exist.

It is only of late years that it has been known to nest in this country, a small colony having established themselves on one of the Scotch lochs. Elsewhere it breeds abundantly throughout Northern Europe, migrating southwards in winter. The nest is placed in a dry situation, at some little distance from the water. The eggs are rather elongated in shape and pale buffish green in colour.

The adult male has a brown head, greenish black on the nape. A white stripe runs down the neck on either side, merging into the white of the under parts. Back and flanks dark brown, mottled with grey. Wing coverts buff; speculum bronze green; tail black, the two central feathers much elongated; under tail coverts black; bill and legs slate grey. The female is of varying shades of buff and brown. The elongated neck and general shape of this species is sufficient to distinguish it from others of its family. The young resemble the female, and moult directly into their full plumage in their first autumn. The eclipse plumage of the Drake, which is dark brown above and smoky grey below, is lost about October. Length 26 in.; wing 11 in.

THE TEAL Nettion crecca (Linnæus)

This is the smallest of our native species of Duck, and is fairly common throughout our islands at all times of the year, but its numbers are largely augmented in winter by the arrival of vast flocks from abroad. It may be found in winter near the mouths of rivers and shallow estuaries as well as inland; its food consists of grain, insects, worms, slugs, and molluscs.

It breeds throughout our islands, but more abundantly in the north. The nest is generally placed at some distance from water on a dry moorland or rough grass-field, and this species makes a rough nest of leaves and grass, lined with down. The eggs, eight to ten in number, are creamy white.

The male has the crown, nape, cheeks, and throat chestnut; an elongated patch of purplish green behind the eye, the rest of the upper parts vermiculated with black and white except the rump and tail coverts, which are black. Under parts white, the lower part of the neck and breast being spotted and sometimes of a yellowish tinge; flanks vermiculated with black. Speculum green and purplish black. Bill black, legs brownish grey. The female is mottled with brown and buff. The young resemble the female. The male in his eclipse dress, which is worn till late in October or November, resembles the female very closely, more so in fact than is the case with any other species. Length 14·5; wing 7·25 in.

THE AMERICAN GREEN-WINGED TEAL Nettion carolinense (J. F. Gmelin)

This species has only occurred three or four times in these islands. The male differs from the Common Teal in having some greyish vermiculated feathers on either side of the breast, and the buffish white lines on the face are very slightly defined. The female cannot be distinguished from our native species. Length 16 in.; wing 7·25 in.

THE BLUE-WINGED TEAL Querquedula discors (Linnæus)

This American species has been taken at least once in the United Kingdom. The male has the throat, forehead, and crown dark lead colour, and a long crescentic patch of white in front of the eye. Cheeks and neck dull lavender grey. Length 16 in.; wing 7·25 in.

THE GARGANEY Querquedula circia (Linnæus)

This is one of our scarcest species, coming to us as a summer immigrant from April to September, and remaining in a few suitable spots to breed. It is commonest in Norfolk, and may also be found in Hants, Kent, Suffolk, and Yorkshire. Elsewhere its occurrences are rare and only consist of stragglers on migration.