A Broken Feather

One of the pair of crows that nest in my woodlot has been flying over all winter long with a gap in his right wing. Three at least of the large wing feathers are missing, and the result is a perceptible limp. The bird moves through the air with the list of a boat that has shifted or lost its ballast. Were he set upon in the air by a hawk, as might happen if he were smaller, the race would be short. He is plainly disabled by the loss of these three feathers, and has been for months. Just how and when the loss occurred I don’t know. It is likely, however, that the feathers were shot away in June,—in corn-stealing time. Now for nearly a year he has been hobbling about on one whole and one half wing, trusting to luck to escape his enemies, until he can get three new feathers to take the places of these that are missing.

Well, why, in all this time, if these three feathers are so necessary, has he not gotten them? He might reply, “Which of you by taking thought can add as much as one cubit to your stature, to say nothing of three hairs to the top of your head?” By taking time (which is a fine human phrase for giving Nature time), and with the right conditions, you may add the cubit. So the crow may get his feathers. It is not an affair between the crow and his feathers, nor between the crow and Nature. It is wholly Nature’s affair with the crow’s feathers, and so seriously does Nature take it, so careful is she, so systematic, so almost arbitrary about it, that the feathers of crows, like the hairs of our heads, can truly be said to be numbered.

Nothing could look more haphazard, certainly, than the way a hen’s feathers seem to drop off at moulting time. The most forlorn, undone, abject creature about the farm is the half-moulted hen. There is one in the chicken yard now, so nearly naked that she really is ashamed of herself, and so miserably helpless that she squats in a corner all night, unable to reach the low poles of the roost. It is a critical experience with the hen, this moulting of her feathers, and were it not for the protection of the yard it might be a fatal experience. Nature seems to have no hand in the business at all; if she has, then what a mess she is making of it!

But pick up the hen, study the falling of the feathers carefully, and lo! here is law and order, system and sequence, as if every feather were a star, every quill a planet, and the old white hen the round sphere of the universe. You will put her down reverently, awfully, this hen that you took up with such compassion, and you will say, “Such knowledge is too wonderful for me.”

So it is, for the moult means a great deal more than the mere renewal of feathers, just how much more no one seems to know. This much is plain, that once a year, usually after the nesting season, it seems a physical necessity for most birds to renew their plumage.

We get a new suit (some of us) because our old one wears out. That is the most apparent cause for the new annual suit of the birds. Yet with them, as with some of the favored of us humans, the feathers go out of fashion, and the change, the moult, is a mere matter of style.

But the annual moult, first of all, is Nature’s wise provision for the safety and warmth of the bird. Feathers are not only covering, as our clothes, but also means of locomotion, and, hence, the bird’s very means of life. A year of use leaves many of the feathers worn and broken, some of them through accident entirely lost (as with my crow), and while they might last for two years, or even longer, Nature has found it necessary to provide a new plumage as often as once a year, in order to keep the race of birds at its best.

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.”

Bobolink passes the winter in Brazil, and at the coming of spring, just before the long northward journey begins, he moults again; but you would hardly know it to look at him, for, strangely enough, he is not black and white, but still colored like a sparrow as he was in the fall. Apparently he is. Look at him more closely, however, and you will find the brownish yellow color is all caused by a veil of fine fringes hanging from the edges of the feathers. Underneath are the black and white and cream-buff. He starts northward, and by the time he reaches Massachusetts the fringe veil is worn off and the black and white bobolink appears. Specimens taken after their arrival here still show traces of the yellow veil.

Many birds do not have this spring moult at all, and with most of those that do, the great wing feathers are not then renewed as are bobolink’s, but only at the annual moult after the nesting is done. In fact, the moulting of the remiges, or wing feathers, seems to be a family affair, the process differing with different families; for these are the bird’s most important feathers, and their loss is so serious a matter that Nature has come to make the change according to the habits and needs of the birds.

With all birds the order is for the body feathers to begin to go first, then the wings, and last the tail. But the shedding of the wing feathers is a very slow and carefully regulated process. In the wild geese and other water birds the wing feathers drop out with the feathers of the body, and all go so simultaneously that the birds cannot fly. On land you could catch them with your hands, but they keep near or on the water and thus escape, though times have been when it was necessary to protect them from their human enemies at this season by special laws.

The necessity for the moult entails many risks, for it exposes the bird to peculiar dangers; yet no single bird is abandoned during this period, none left without a way of escape. The geese, as we have seen, moult most rapidly and hence are most helpless, but there are few of their enemies that they cannot avoid by keeping to the water and grassy marshes; the hawks, that hunt by wing, moult so slowly that they do not feel a loss of power; while such birds as the quail and grouse, that always depend in part for protection upon the blending of their colors with the colors of their environment, seem especially so protected during the moulting season. A grouse blotched with light patches, where the dark-tipped feathers have fallen away, may so melt into the mottled color scheme of its background as to escape the sharpest eye.

Such a rapid, wholesale moult as in the case of the geese would be fatal to land birds. Instead, their primaries, or large wing feathers, drop out one or two at a time and symmetrically from the two wings. Oftentimes it is the two inner primaries that go first, then the others following one at a time, the outermost last. This order varies, as in the kingfisher. In the snow bunting all but two of the old primaries are gone before any new ones have grown as large as the secondaries. In the hawks, again, birds that must use their wings and must have them always at their best, the moulting of the wing feathers is very slow, lasting nearly the whole year. The homing pigeon, another great flier, but not of the same kind as the hawks, begins about May to moult his wing feathers, losing the tenth primary first, a month later the ninth, then the others at intervals of from eight to fifteen days.

It is quite enough to make one pause, to make one even wonder, when he finds that this seemingly insignificant matter is taken so seriously by nature, and that even here there is that perfect adaptation of means to end. The gosling, to cite another instance, goes six weeks in down, then gets its first feathers, which it sheds in the fall. The young quail, on the other hand, is born with quills so far advanced that it is able to fly almost as soon as it is hatched. These are mature feathers; but the bird is still young and growing, and soon outgrows these first flight feathers, so that they are quickly lost and new ones come. This goes on till fall, several moults occurring the first summer to meet the increasing weight of the growing body.

Where there are peculiar uses made of the tail, as with the chimney swifts and woodpeckers, there is a peculiar order of moulting. In most birds the tail is a kind of balance or steering-gear, and not of equal importance with the wings. Nature, consequently, seems to have attached less importance to the feathers of the tail. They are not so firmly set, and they are hardly of the same quality or kind; for if a wing feather is once broken or lost, after the moult, it must go unmended until the annual moulting time comes round again; whereas, if a tail feather is lost through accident, it is made good, no matter when. How do you explain that? I know that old theory of the birds roosting with their tails out, and so, through generations of lost tails, those feathers now grow, expecting to be plucked by some enemy, and so have only a temporary hold. Perhaps.

The normal, natural way, of course, is to replace a lost feather with a new one as soon as possible; but in order to give extra strength to the wing feathers nature has found it necessary to check their frequent change, and so complete is the check that the annual moult is required to replace one of them. The Japanese have discovered the secret of this check, and are able by it to keep certain feathers in the tails of their cocks growing until they reach the enormous length of ten to twelve feet.

My crow, it seems, lost his three feathers just after his annual moult; the three broken shafts he carries still in his wing, and must continue to carry, as the stars must continue their courses. These three feathers must round out their cycle to the annual moult. The universe of worlds and feathers is a universe of law, of order, and of reason.