
After searching my
Birds of Washington State book, and reading the descriptions of many yellow birds which look like this one, I narrowed it down to about three, then with the help of
All about birds.org I am pretty sure this is a Orange crowned Warbler. As I saw it just one time at the feeder, I presume it just stopped by for a quick snack, on it's way to a warmer place to spend the winter.
Mary Lou pointed out that she has had a Ruby Crowned kinglet at her feeder, and when I took a look at the picture of one in my bird book, I think I was mistaken in calling this one a Orange Crowned Warbler, because it has a white undertail which the Kinglet has and also the markings around the eye are more like a Kinglets. Thanks Mary Lou for pointing this out.