A selection of Lesser Black-backed Gulls Larus fuscus that I photographed at the North Point Marina, Winthrop Harbor, Illinois, USA during my trip to the States in February.
As a Dutch gull watcher, I very much associate Lesser Black-backed Gulls with Europe and Africa and I found it very odd to come across a handful of individuals during my trip.
I also noticed that these American individuals looked very similar to the type of Lesser Black-backed Gulls that I am used to seeing in the Netherlands (of the ‘Dutch intergrade type’: a mix of graellsii and intermedius); including the shade of gray in the mantle and wings.
Adult with mirror across both webs on P10 and a small mirror on the outer web of P9. No black on P4 or P3.
Adult with mirror across both webs on P10 and a small mirror on the inner web of P9. P4 has a small black spot on the outer web.
3rd-cycle / 4th-calendar year type, based on the adult-type primaries with small apical spots, brown hue in the upper wing coverts, brown lesser coverts in the lower wing, black remnants in the tail, much black in the primary coverts and much black in the bill.
North Point Marina, Winthrop Harbor, Illinois, USA: