It is important to note that among birds the fathers devoid of affection generally belong to the less intelligent species. We may, therefore, see that these violent polygamous amours of the male, which result in the development of the more extravagant of the second sexual characters, are not really favourable to the development of the species. They belong to a lower grade of sexual evolution. And a further proof, it seems to me, is furnished as we note that, in spite of this tyranny, the females show considerable affection for these tyrant males--the chimpanzee, for example, proving this by zealously plucking the lice from her master's coat, which with monkeys is a mark of very special attention.[91] The most oppressed females are, as a rule, the most faithful wives. Thus the females of the guanaco lamas, if their master chances to be wounded or killed, do not run away; they hasten to his side, bleating and offering themselves to the shots of the hunter in order to shield him, while, in sharp contrast, if a female is killed, the male makes off with all his troop--he thinks only of himself.[92] Must we say, then, that the female animal likes servitude? It is, of course, because the aggressive male, being the one to arouse her sexual passions, enables her to fulfil her work of procreation. This may be. But, granting this explanation, it must be allowed that love under such conditions evidences a deterioration, not alone in the size and strength of the female, but in mental capacity--love at a much lower level than those beautiful cases in which the sexes are more alike, equal in capacity, and co-operate together in the race work. Yet in justice it must be added that even the most polygamous males are not always devoid of affection. I once saw on a Derbyshire high-road a cock show evident signs of sorrow over the death of one of his wives, who had been killed by a passing motor. He refused to leave the spot where her body lay, and walked round and round it, uttering sharp cries of grief. Nor are sexual lapses confined to the males; a female will take advantage of a moment when the attention of the old cocks is entirely absorbed by the anxiety of a fight, to run off with a young male.[93] Even among species noted for their conjugal fidelity this sometimes happens. Female pigeons, for example, have been known to fall violently in love with strange males, and this is especially common if the legitimate spouse is wounded or becomes weak.[94] Darwin records a very curious case of a sudden passion appearing in a female wild-duck, who, after breeding with her own mallard for a couple of seasons, deserted him for a stranger--a male pintail.