European herring gull
Adult European herring gulls are similar to ring-billed gulls, but are much larger, have pinkish legs, and a much thicker yellow bill with more pronounced gonys. First-winter European herring gulls are much browner, but second- and third-winter birds can be confusing since soft part colours are variable and third-year herring gull often show a ring around the bill. Such birds are most easily distinguished by the larger size and larger bill of European herring gull.