It is still more remarkable that the reeves also, even in the presence of the males, will court each other and have intercourse.[8] We may associate this with the high erotic development of birds, the difficulty with which tumescence seems to occur in them, and their long courtships.
Among the higher animals, again, female monkeys, even when grown up (as Moll was informed), behave in a sexual way to each other, though it is difficult to say how far this is merely in play.

Dr.Seitz, Director of the Frankfurt Zooelogical Garden, gave Moll a record of his own careful observations of homosexual phenomena among the males and females of various animals confined in the Garden (_Antelope cervicapra, Bos Indicus, Capra hircus, Ovis steatopyga_).[9] In all such cases we are not concerned with sexual inversion, but merely with the accidental turning of the sexual instinct into an abnormal channel, the instinct being called out by an approximate substitute, or even by diffused emotional excitement, in the absence of the normal object.
It is probable, however, that cases of true sexual inversion--in which gratification is preferably sought in the same sex--may be found among animals, although observations have rarely been made or recorded.

It has been found by Muccioli, an Italian authority on pigeons, that among Belgian carrier-pigeons inverted practices may occur, even in the presence of many of the other sex.[10] This seems to be true inversion, though we are not told whether these birds were also attracted toward the opposite sex.

The birds of this family appear to be specially liable to sexual perversion.

Thus M.J.