scratching; and, in doing this, it leaves a track on the sand or gravel which is quite perceptible through the glasses, and which I believe is made by the strongly bent-in tail as well as by the feet. It thus clings with wings, tail, and body, whilst scratching, far more than clinging, with its claws."
"It may be asked what part in all this does the beak play? In those birds which I have been just now watching at some twenty paces through glasses that brought them just under my eyes, and in bright sunlight, it seemed to play none at all. It might have been expected that, in thus commencing, the martins would cling with the feet whilst working with the bill. These have certainly not done so, nor have they ever been head downwards, either now or before. I have not yet seen a sand-martin in this position, or even approaching to it. The tail, which is made to play so great a part, would here lose much of its efficacy, but I do not at all think that they never do hang like this. Within certain wide limits, birds, in my experience, act, not uniformly, but with great variety. Probably, with longer watching, I should have seen this attitude, and, also, the bill used as well as the feet. Whether it is used or not in the first commencement of an excavation, it certainly is—in the way I have described—during the later stages."
"I notice again this morning a particular hole, only about an inch deep, and at the bottom of which there is a large stone, naturally imbedded in the sand. No birds are now working at this, but, on the last occasion, one was attacked several times in succession, whilst doing so, by another. This seems as though
