"The Ducks are of two sorts, either wild or tame. The wild, again, are of two sorts:--1, Sea Ducks, which feed mostwhat in salt waters, dive much in feeding, have a broader bill (especially the upper one), and bending forward to work on the stem; a large hind toe, and then, likely for a rudder, a long train, not sharp-pointed. 2, Pond Ducks, which haunt plashes, have a straight and narrower bill, a very little hind toe, a sharp-pointed train, a white belly, speckled feathers, black, with glittering green on the middle wing, with a white transverse ring on either side." According to Mr. Yarrell, the first division of Ducks comprises the Wild Duck, Shieldrake, Muscovy Duck, Gadwall, Shoveller, Pintail, Widgeon, Bimaculated Duck, Garganey, and Teals, all of which exhibit length of neck, wings reaching to the end of the tail, tarsi somewhat round, hind toe free or without pendent lobe. They generally frequent fresh water, but pass much of their time on land, feeding on aquatic plants, insects, worms, and sometimes fish. The second division includes the Red Crested Duck, Poachard, Ferruginous Duck, Scaup, Tufted Duck, Harlequin Duck, Long-tailed Duck, and Golden Eye; while between the two divisions he places, as possessing some of the characters of each, the Eider Duck, King Duck, Velvet Duck, and Scoter. McGillivray accepts this arrangement, with some slight variations, remarking that the differences as to habits, as well as structure, are quite obvious; and he gives us a graphic description of the three types. "High in air," he says, "advancing on gently-arched and outspread wings, that winnow a passage for them over the far-spreading sea, is seen advancing from the north a flock of large birds, that are observed, as they draw nearer, to be arranged in lines ever undulating and changing figure; while their clear cries seem to express their joy at having escaped the dangers of their long passage over the waste of waters. Now they descend, mingle their ranks, wheel in dislocated bands, unite, sweep along, and, clamorous in their joy, at length alight on the open pasture. Having rested awhile and plumed themselves, they begin to move about in search of food, walking sedately and with decurrent necks, stretching their strong bills to the ground, from which they wrench the roots of the grasses, and pluck the herbage. Prudent, however, as they well need be in an unexplored tract, and careful of their safety, they neither scatter about at random nor leave themselves subject to surprise. Should a suspicious object present itself, one of them presently erects himself and emits a warning cry, on hearing which they all rise together, raise their necks to their full stretch, and carefully inspect the ground. Should the danger be imminent, they run a few paces forward, spread out their large wings, ascend into the air, and betake themselves to some distant place." These are of the first division, or _Cribatores_, as Mr.