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During the Spring and Summer, the factory roofs and roadside lamp-posts, in an Industrial Estate and neighbouring Retail Park on the outskirts of Newport s-Wales, were well and truly claimed by Herring and Lesser Black-backed Gulls. The roofs as nesting sites and the lamp-posts as perches, as they have been for several years.
Recently, most of these seem to have "moved on"; is it likely that they have gone to sea or just found other on-land locations with better food opportunities?
Their place seems to have been taken by small groups of Black-headed Gulls (winter plumage)- something I haven't noticed before. Is it likely that they have taken over only because the bigger birds' bullying would have kept them out beforehand?
Any other, perhaps more scientific, views on this "rotation"?