There appears to be no direct evidence, however, that female birds are more charmed by one male than another, and prefer him on account of his superior song, as the theory of Sexual Selection postulates. And when we remember that likewise there is no evidence that birds, etc., are ever influenced in their choice by the superior colours of certain males, and that in fact it is the rule for the female to follow passively the most vigorous and victorious male, we are brought back to the conclusion with which we set out—that it is not the superior songster who wins the female by charming her, but the loudest and most persistent songster, by guiding her to the courting-place.
Darwin himself evidently felt the weakness of his position, for he constantly speaks of “love-charms or love-calls” in the same sentence. Thus, “the true song of most birds and various strange cries are uttered chiefly during the breeding-season, and serve as a charm, or merely as a call-note, to the other sex.” Again: “It is often difficult to conjecture whether the many strange cries and notes uttered by male birds during the breeding-season serve as a charm or merely as a call to the female.” The distinction between love “charms” and mere “calls” is of course of the utmost importance. For if male song charms the females and influences them in their choice, we have Sexual-æsthetic-female Selection. But if the male song merely serves as a call to the female and as a sign of species-recognition, then Natural Selection accounts for everything, because the most vigorous, loudest, and most persistent male will have the choice of the most numerous females brought to his side by his musical efforts.
LOVE-DANCES AND DISPLAY
There is one more important link in the chain of Darwin’s reasoning, which must be broken before his theory of Sexual Selection can be regarded as demolished. The mad antics of the blackcock and other birds have been already referred to; and some of the lower animals seem to endeavour to surpass them, as, for example, the male alligator, who strives to attract the attention of the female by splashing and roaring in the water; “swollen to an extent ready to burst, with its head and tail lifted up, he spins or twirls round on the surface of the water, like an Indian chief rehearsing his feats of war.” “To suppose,” says Darwin, “that the females do not appreciate the beauty of the males, is to admit that their splendid decorations, all their pomp and display, are useless; and this is incredible.”
But are there no other ways of accounting for all this “pomp and display”? Certainly, several of them. We have seen that the most vigorous males are those which are most highly ornamented, and that it is the vigour and vivacity of the males that seems to decide the choice of the females where there is any. Now instinct, i.e. inherited experience, teaches the female the connection between vigour and display of ornament, and influences her choice accordingly. Again, the males indulge in their display for the purpose of arousing the attention of the passive female. This supposition is rendered the more probable by Darwin’s admission that “we must be cautious in concluding that the wings are spread out solely for display, as some birds do so whose wings are not beautiful.”
A third motive of display is the need of finding an outlet for overflowing nervous energy and excitement. To this Mr. Wallace refers as follows: “At pairing time the male is in a state of excitement and full of exuberant energy. Even unornamented birds flutter their wings or spread them out, erect their tails or crests, and thus give vent to the nervous excitability with which they are overcharged.” “It is not improbable,” he continues—and this suggests a fourth use of display—"that crests and other erectile feathers may be primarily of use in frightening away enemies, since they are generally erected when angry or during combat."
A fifth motive of display is suggested by an analogy furnished by human butterflies and birds of Paradise. Among animals where the sexes differ, it is commonly the male who is adorned the most. With us it is the women. But woman’s fineries are not intended to charm the eyes of men, but to excite one another’s rivalry and envy. Now it seems that male birds, with whose plumes our heartless women are so fond of decking themselves, are guilty of an analogous weakness. They will sometimes display their ornaments, says Darwin, “when not in the presence of the females, as occasionally occurs with grouse at their holyholy places, and as may be noticed with the peacock; this latter bird, however, evidently wishes for a spectator of some kind, and, as I have often seen, will show off his finery before poultry or even pigs. All naturalists who have closely attended to the habits of birds, whether in a state of nature or under confinement, are unanimously of opinion that the males take delight in displaying their beauty.”beauty.” And, once more, “with birds of Paradise a dozen or more full-plumaged males congregate in a tree to hold a dancing-party, as it is called by the natives; and here they fly about, raise their wings, elevate their exquisite plumes, and make them vibrate; and the whole tree seems, as Mr. Wallace remarks, to be filled with waving plumes.”
But if it be the unanimous opinion of naturalists who have closely studied the habits of birds, “that the males take delight in displaying their beauty,” why should not the females also take pleasure in witnessing this display? Perhaps they do, sometimes; for even Mr. Wallace admits that “the display of the various ornamental appendages of the male during courtship may be attractive” to the female. But there is a world-wide difference between this assertion and the doctrine that the females are so greatly and so constantly influenced by their æsthetic taste that they always prefer among males those that are slightly more beautiful than the others, thus increasing their personal beauty by transmission. This is an assumption unsupported by facts, and rendered unnecessary because Natural Selection accounts for all the phenomena in question.
Admiration of Personal Beauty does not appear, therefore, to enter noticeably into animal love, except in so far as a slight amount of æsthetic taste may be admitted in birds. This taste may be strengthened by the sight of the brilliant masculine ornaments during the season of love being associated with the remembered pleasures of courtship.
Indirectly, however, female animals promote the cause of beauty by preferring the more healthy and vigorous individuals, who are commonly also the most beautiful ones. And is not the same true of females of the human persuasion, who likewise are much less influenced in their choice by the beauty than by the boldness, energy, vivacity, and “manliness” of their suitors? It seems to hold true throughout nature that the female’s Love is weak in the æsthetic element, her taste being little developed and too often neutralised by unconscious utilitarian considerations.
LOVE AMONG SAVAGES