Initially identified as Common the European subspecies it's now believed by Sean to be the northwestern North American subspecies.
The Mew Gull hung out in the mostly Ringbilleds gull flock ~200 ft from the western shoreline of Prospect Lake. It stayed there for about an hour affording excellent looks for the small flash mob . This species is very likely Prospects first record.
To distinguish the Mew from likewise Ringbilleds,look at the thinner darker pale yellow bill with no ring band. Also there's a characteristic white tertial patch on its back..
The gull flew out about 220.
See the previous post of the bird on Twitter link. Mike Yuan photo
