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One of about 12 at Bay of Birsay today. First time up there in 3 months. Of note were the 25 or so great skuas together on the sea feeding or stealing food from gannets. The gannets were of interest too as they appear to be nesting on the cliffs of Marwick Head, a new colony. A few puffins too (extra). The cliffs were teeming with razorbill, guillemot, kittiwakes, fulmars etc.