Among the gulls at Sage Beach today were two birds that look to me like second year Mew Gulls. One of them had black on its tail he other had a pure white tail. I noticed in Sibley’s that the European population of the Mew Gull has second year birds with white tail feathers, while the American form is shown with black on the tail feathers. However, Sibley’s also indicates that the Common Mew Gulls that have been reported in Alaska are from the Siberian population, but there is not a picture of that form. Are there any gull experts out there that might be able to help me with this? Do the short-billed (American) population birds sometimes have all white tail feathers?