The ring-billed gul is one of the more common ones to find in Alberta and around Calgary. The spots along its head are something that both male and female gulls undergo as part of a seasonal moult during the fall and winter. They have yellow eyes, and their bill has a black band. They are the type of gulls most likely to see in inland locations but do nest near freshwater sources. They are well adapted to humans and common in cities, docks, and even in parking lots, as I have seen many times over the years.
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From @mmckinneyphoto13