128 



BIRD WATCHING 



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 guUery 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. 



