Young gulls are, to the careless eye, apt to look larger than their parents, an illusion possibly due to the optical effect of their dappled plumage, and few people unfamiliar with these birds in their succeeding moults readily believe that the dark birds are younger than the white. Down in little Cornish harbours I have sometimes watched these young birds turned to good account by their lazy elders, who call them to the feast whenever the ebbing tide uncovers a heap of dead pilchards lying in three or four feet of water, and then pounce on them the moment they come to the surface with their booty. The fact is that gulls are not expert divers. The cormorant and puffin and guillemot can vanish at the flash of a gun, reappearing far from where they were last seen, and can pursue and catch some of the swiftest fishes under water. Some gulls, however, are able to plunge farther below the surface than others, and the little kittiwake is perhaps the most expert diver of them all, though in no sense at home under water like the shag. I have often, when at anchor ten or fifteen miles from the land, and attended by the usual convoy of seabirds that invariably gather round fishing-boats, amused myself by throwing scraps of fish to them and watching the gulls do their best to plunge below the surface when some coveted morsel was going down into the depths, and now and again a little Roman-nose puffin would dive headlong and snatch the prize from under the gulls' eyes. Most of the birds were fearless enough; only an occasional "saddleback"--the greater black-backed gull of the text-books--knowing the hand of man to be against it for its raids on game and poultry, would keep at a respectful distance.