Black-backed Gull at Van Wagners Beach in Hamilton, Ontario, on 12 October
2013. It is now believed that the Lesser Black-backed Gulls
occurring in North America originate from colonies in southern
Greenland. Like other gulls that breed at northern latitudes, it
will retain its juvenal plumage longer into the winter. When in
southern Greenland on 5 September 2013, I saw a fledged juvenile
Lesser Black-backed Gull still with down on its head.