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 witnessed. It would appear, therefore, that the curious flights of two birds up into the air, the one of them exactly over, and almost touching, the other—wherein, as I have noted, there is frequently a blow with the wings which, to judge by the sound reaching me from a considerable distance, must be sometimes a severe one—are the aerial continuations of combats commenced on the ground." Sometimes, that is to say. There seems no reason why birds accustomed thus to contend, should not sometimes do so ab initio, and without any preliminary encounter on mother earth—and this, I believe, is the case.

Here, then, in the stock-dove we have at the nuptial season a kind of flight which seems certainly to be of the nature of a combat, very much resembling that of the peewit at the same season. I have seen peewits fighting on the ground, and once they were for a moment in the air together at a foot or two above it, and the one a little above the other. This, however, may have been mere chance, and I have not seen the one form of combat arise unmistakably out of the other, as in the case of the stock-doves. But assuming that in each case there is a combat, is it certain that the contending birds are always, or generally, two males, and not male and female? It certainly seems natural to suppose this, but with the stock-dove, at any rate (and I believe with pigeons generally), the two sexes sometimes fight sharply; and, moreover, the female stock-dove bows to the male, as well as the male to the female, both which points will be brought out in the following instances:—

"A hen bird is sitting alone on the sand, a male