Birding World published this article on the remarkable discovery of Kelp Gulls on the Atlantic Coast of Morocco - see link here http://www.go-south.org/papers1/berg...ding_world.pdf
I visited the site two years ago and too claimed 10 adult birds - several of which were nesting on islands in amongst Yellow-legged Gulls. Whilst watching them, Robert Fuge and I were concerned at the apparent pink tones to the leg colour and the large size and bill size, but the short primary projection and short tibia convinced us we were watching Kelp Gulls.
This spring, birders again visited the site and took more photographs and it now appears that the colony is largely made up of breeding Great Black-backed Gulls - a quite unexpected and quite incredible prospect. The species breeds only in Norway (32% of the population), Scotland (17%), Ireland and Iceland (17%) but has relatively recently colonized the rocky islets on the Brittany coast in France.