Other species, while they have renounced promiscuity, are still determined polygamists. The gallinaceæ are particularly addicted to this form of conjugal union, which is so common, in fact, with mankind, even when highly civilised and boasting of their practice of monogamy. Our barn-door cock, vain and sensual, courageous and jealous, is a perfect type of the polygamous bird. But the polygamous habits of the gallinaceæ do not prevent them from experiencing very strong sexual passion. When seized by this frenzy of desire, some of them appear to be senseless of all danger. The firing of a gun, for example, does not alarm a male grouse when swinging his head and whistling to charm his female;[40] but this ardour does not hinder him from being a fickle animal, always in search of new adventures, and always seeking fresh mates.[41] These examples of wandering fancy are for the most part rare among birds, the majority of whom are monogamous, and even far superior to most men in the matter of conjugal fidelity. Nearly all the rapacious animals, even the stupid vultures, are monogamous. The conjugal union of the bald-headed eagle appears even to last till the death of one of the partners. This is indeed monogamic and indissoluble marriage, though without legal constraint.[42] Golden eagles live in couples, and remain attached to each other for years without even changing their domicile.[43] But these instances, honourable as they are, have nothing exceptional in them; strong conjugal attachment is a sentiment common to many birds.