Page:BirdWatcherShetlands.djvu/205

Rh bird continuing to stand where it had been, and I had been watching them up almost to that very second, my head over the ledge all the time. Even could the bird which had petted the chick have flown off without my noticing it—which I do not think it could have done—it would have been impossible, surely, for it to have caught a fish and returned in so very short a time. The chick, therefore, appears to have been petted by a third bird, not being either of its parents, for the white-eyed one stood apart all the time, so that even if it had not been distinguished in this way I could not have confused it with either of the other two. This is interesting, I think, if it is really the case, for here, as with terns, we see the beginning of what might in time lead to something similar, in a social community of birds, to what we see in those of insects—the absorption, that is to say, of the individualised parental instinct into the generalised one of the whole community.

It is natural, at present, we will suppose, for every pair of birds in a colony of terns or guillemots to feel affection for, and to tend, their own young. Were this affection, and the active expression of it, to extend to the young of other members of the community, then, as every pair of birds would probably be able to supply the wants of more than its own young, a lesser number than the whole community would be sufficient for nursery work, leaving the others free for—what we cannot say, but nature might evolve her product out of the material thus placed at her disposal. Some