The common mallard or wild duck, and the teal, being resident breeding birds, are the first to become noticeable in winter, and many thousands are annually taken in the few remaining decoys of this country. The mallard is an exceedingly handsome bird, and one of the largest of its kind. It is an early breeder, and soon after the brown duck begins to sit the male moults the whole of its flight feathers. So sudden and simultaneous is this process that for six weeks in summer the usually handsome drake is quite incapable of flight; and it is probably at this period of its ground existence that the assumption of the duck's plumage is such an aid to protection. The mallard is not strictly a ground builder, as its nest is sometimes at a considerable altitude, nests of a rook and a hawk having been taken advantage of. In such case the young birds are probably brought to the ground in the bill of the old one. To such an extent did the mallard at one time breed among the fens in this country, that it was customary before the young could fly for a number of persons to engage in what was termed a "driving of ducks," when as many as one thousand eight hundred birds have been taken. Although wild and wary under ordinary circumstances, the mallard upon occasion has shown remarkable tameness. In severe weather two hundred birds have assembled upon a pond and accepted oats at not more than an arm's length from the feeder. Under ordinary circumstances the common wild duck feeds upon floating grasses, grain, insects, and worms; a well-grown mallard sometimes weighs three pounds.