Notwithstanding the separation which, with the exception of certain seasons, subsists between the cock and hen turkey in a wild state, they have been taught to feed and live amiably together in a state of domesticity. The former, however, retains sufficient of his hereditary propensities to give an occasional sly blow to a froward chicken, but that very seldom of a serious or malicious character. One reason why the turkeys seen in poultry-yards do not vie in splendor of plumage with their untamed brethren is, that they are not allowed to live long enough. For the same cause, the thorough development of their temper and disposition is seldom witnessed. It does not attain its full growth till its fifth or sixth year, yet it is killed at latest in the second, to the evident deterioration of the stock. If some of the best breeds were retained to their really adult state, and well fed meanwhile, they would quite recompense their keeper by their beauty in full plumage, their glancing hues of gilded green and purple, their lovely shades of bronze, brown, and black, and the pearly lustre that radiates from their polished feathers. THE DUCK. This bird is of the order of _natatores_, or swimmers; family, _anatidæ_, of the duck kind; genus, _anas_, or duck. The most striking character of the swimming bird is derived from the structure of the _feet_, which are always palmate--that is, furnished with webs between the toes. There are always three toes directed forward, and these are usually united by a membrane to their extremities; but, in some cases, the membrane is deeply cleft, and the toes are occasionally quite free, and furnished with a distinct web on each side. The fourth toe is generally but little developed, and often entirely wanting; when present, it is usually directed backward, and the membrane is sometimes continued to it along the side of the feet. These webbed feet are the principal agents by which the birds propel themselves through the water, upon the surface of which most of them pass a great portion of their time. The feet are generally placed very far back, a position which is exceedingly favorable to their action in swimming, but which renders their progression on the land somewhat awkward. [Illustration: THE EIDER DUCK.] The _body_ is generally stout and heavy, and covered with a very thick, close, downy plumage, which the bird keeps constantly anointed with the greasy secretions of the caudal gland, so that it is completely water-proof. The _wings_ exhibit a great variety in their development; in some species being merely rudimentary, destitute of quills, and covered with a scaly skin--in others, being of vast size and power, and the birds passing a great part of their lives in the air. The form of the _bill_ is also very remarkable; in some, broad and flat; in others, deep and compressed; and in others, long and slender.