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128 turn to bay, and drive the robber off. Gulls seem to fear the great skua less than the Arctic one, and will sometimes mob and molest it. A single pair that had nested on the outskirts of a gullery were a good deal subject to this annoyance. One and then another gull would pursue them when they flew near, and sometimes even swoop at them from side to side as they stood upon the heather. But I never saw them annoy the Arctic skuas in this manner. The latter, however, were much more numerous.