BIRD SYMPATHY
T
TO-DAY—which is my third here upon the island—I was actually assaulted by the terns. I saw a young one, now well advanced, that flew for a little and then went down on the grass. Walking towards it, a bird—presumably one of the parents—descended upon me twice in succession, and, with that angry and piercing cry that I have spoken or ought to have spoken of—it sounds very like a shrill "bah!"—delivered a fierce peck at my head, so that I felt it each time, quite unpleasantly, through the thin cloth of my cap. The difference is to be noted in this form of attack, to that employed by gulls and skuas, the former in battles inter se only, and the latter as against man in defence of their eggs or young. Both of them, when they thus "swoop to their revenge," use the feet only, and the superiority of the tern's method is so great that it makes this small bird almost as redoubtable—if this exaggerated word may be pardoned—as even the largest of the others. The Great Skua, especially, were it to use its powerful beak, would be really formidable, even to a man. In fighting with its fellows, it no doubt does so, and gulls, under these circumstances, make the greatest use of theirs. This, however, is when they struggle together on the ground; but when one fights on the ground and the other in the air, the latter uses its feet only, with effects that are irritating rather than to be feared. Now why is this, and what causes the difference in this respect as between gull and tern? From my own observation I think I can explain it. So long as two contending gulls fight with any equality, they do so upon the ground, but when one of them can no longer hold his own there, he rises into the air and, sweeping backwards and forwards over the other, who stays where he was, annoys him in this particular way. The bird, therefore, by whom these tactics are resorted to has already got the worst of it, and the last thing he wishes is again to close with a rival who has defeated him. This, however, is exactly what would happen were he to use his hooked beak in the manner proper to it, for it is adapted for seizing and tearing, and to these uses it has hitherto been put. To peck or stab with it would be like making a thrust with a sickle, and though possibly as against a weaker antagonist it might be made effectual in some other than the normal way, yet here there is always the fear of detention, to check any experiment of the sort. Let the hooked tip but pierce the skin to any extent, and the swoop would be checked sufficiently to allow of the flying bird's being seized. The feet, therefore, though without efficient claws and quite unadapted to anything except swimming, are employed by preference, and in the manner in which they are used we see the same principle at work, for instead of making any attempt at grasping or scratching, the flying gull, as it sweeps by, just gives a flick with the back of them, which the other revenges or parries with a blow of the wing.
The tern, however, having a straight and sharply pointed bill, adapted for pecking, and nothing else, can use it in this manner when flying also, though in other respects it delivers its attack in exactly the same manner as the gull does, allowing for the difference in bulk and aerial grace and mastery, between the two birds. Here, as it appears to me, we see structure affecting habit. As a rule, I think, it is rather the other way, for it is wonderful to how many uses, other than the primary one for the performance of which it has been specially adapted, almost any part of an animal's anatomy may be put. And indeed, if we look at it in another way, this truth is as strikingly illustrated by what we have just been considering as by almost anything, for the webbed foot of a gull or any swimming bird is extremely unadapted for fighting, and yet we here see it thus employed. But it is owing to the structure of the beak, in my opinion, that this has come about. That is the bird's real weapon, which I am convinced it would always use if it could or if it dared. Not even in their rough-and-tumbles, where they close and roll over and over together, have I seen gulls fight with their feet, upon the ground.
I had not gone far, after this episode with the terns, when I was pecked at, twice again, by another one, under similar circumstances. Each time, I believe, the sharp point of the beak went through the slight stuff of my cap, or I should hardly have felt it so sharply. It is not only the skuas, then, that attack you in defence of their young. These terns, though so much smaller, do so too, and, as appears by the story, they have more than one weapon in their armoury. But a more interesting experience was in store for me, which brought still more forcibly to my mind that incident with the wounded tern to which I have before alluded. Walking on, I noticed a bird which, though a young one, looked almost in its full plumage, and which kept flying for a little, and then going down again at some distance in front of me. Every time it alighted, a cloud of terns hovered excitedly over it, and first one, and then another of them kept swooping down, so as just or almost to touch it, until at last it flew up again, so that I could never approach it more nearly. It certainly seemed to me as though the grown community were trying to get this young one to fly, so as to be out of danger, and this they always succeeded in doing. I do not think they really prevented me from catching the bird, for, no doubt, it would have flown of itself before very long; but what interest and sympathy shown! Moreover, had I been pursuing it with a gun it might have made all the difference.
BIRD SYMPATHY