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eral nests and see what both old and young are about. On the island close to Sark, called Isle de Merchant, or Brechou, especially on the steep rocky side nearest to Sark; a great many also breed on and about the Autelets: in fact, almost all the grandest and wildest scenery in Sark has been appropriated by the Herring Gulls for their breeding-places, who, except for the Shags, hold almost undisputed possession of the grandest part of the Island. On the east side, or that towards France, few or no Herring Gulls breed; the cliffs being more sloping, and covered with grass and gorse, and heather, are not at all suited for breeding purposes for the Herring Gull. A few pairs have lately set up a small breeding-station on the rock before mentioned near Jethou, as La Fauconniere; a very few also breed on Herm on the south part nearest to Jethou, but none that we could see on the rocks to the north of Herm. A great many breed also in Alderney on the south and east sides, but none on the little island of Burhou, which has been entirely appropriated by the Lesser Black-backs; in all these places the Herring Gulls and Shags take almost entire possession of the rocks, the Lesser Black-backs apparently never mixing with them; indeed, except a chance straggler or two passing by, a Lesser Black-back is scarcely to be seen at any of these stations. The Herring Gull and the Lesser Black-back, though very distinct in their adult plumage, and even before they fully arrive at maturity, as soon as they begin to show the different colour of the mantle, which they do in their second autumn, when a few of either the dark or the pale grey feathers appear amongst the brownish ones of the young bird, are before this change begins very much alike. In the down I think they are almost, if not quite, indistinguishable after that in their first feathers, and up to their first winter they appear to me distinguishable. As far as the primary quills go I do not see much difference; the shafts, perhaps, of the quills of the Lesser Black-back are darker than those of the Herring, but the difference if anything is very slight; but the head and neck and the centres of the feathers of the back of the Lesser Black-back are darker,--more of a dark smoky brown than those of the Herring Gull: this difference of colour is even more apparent on the under surface, including the breast, belly, and flanks. The shoulder of the wing and the under wing-coverts of the Lesse
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