[Mystery bird] Probable Anna’s Hummingbird, Calypte anna, photographed in Seattle, Washington. “[T]his [bird] has almost a yellow stripe from behind the eyes, down the side of the head and down the back. [A]lso the same yellow appears on about the center of the outer wing. It is much smaller than the Anna’s that usually come [to the hummingbird feeder]”, writes the photographer.
Please name at least one field mark that supports your identification.