But there are other reasons, at least there are advantages taken of the moult for other ends: such as the adaptation of the feathers to the varying temperatures of the seasons,—heavier in winter and lighter in summer; also the adaptation of the color of the plumage to the changing colors of the environment,—as the change from the dark summer color of the ptarmigan to its snow-white winter plumage to match the snows of its far northern home; then, and perhaps most interesting of all, is the advantage taken of the moult, for the adorning of the bird for the mating season. Indeed, Nature goes so far, in some cases, as to cause a special moult to meet the exigencies of the wedding,—as if fine feathers _do_ make a fine bird. All this to meet the fancy of the bride! so, at least, the scientists tell us. Whether or not her fancy is the cause, it is a fact that among the birds it is the bridegroom who is adorned for his wife, and sometimes the fine feathers come by a special moult. Not far from my house is a nest of black-crowned night herons, or “quawks.” Preparatory to the mating of the pair there started from the crown of the male (and female, also, in this case,) two or three white, rounded plumes, which now hang eight inches in length, waving gracefully to his shoulders. They are the special glory of the wedding time; but soon after the nesting season is over they will drop out, not to come again until he goes a-wooing Mrs. Quawk once more. In the white American egret, and in the snowy egret, the plumes number about fifty, and occur upon the back close to the tail. They are straight in the American, recurved in the snowy, and make the famous “aigrette” plumes of the milliner. The birds are shot in their nuptial dress, and so great has been the heartless demand that both species, once very abundant, are now almost extinct. Bobolink is another special case. He has two complete moults a year. Now, as I write, I hear him singing over the meadow,—a jet black, white, and cream-buff lover, most strikingly adorned. His wife, down in the grass, looks as little like him as a sparrow looks like a blackbird. After the breeding season he moults, changing color so completely that he and his wife and children all look alike, all like sparrows. They even lose their name now, flying south under the assumed name of “reedbirds.”