Spring migration is picking up, with good numbers of warblers just starting to arrive, just in time for my Warblers and Flycatchers class next week. Here is a Yellow-rumped Warbler in a field of little flowers which I think are spring beauties. How appropriate is that?
Townsend’s Warbler
Black-throated Gray Warbler
Migrant warblers are often found in big leaf maples this time of year. The blossoms attract insects that the birds feed on.
Not a warbler, but still a neat find is this Belted Kingfisher burrow along the Columbia River. The burrow is pretty low, and in a area that gets a lot of human and dog traffic, so it will be interesting to see if the birds can successfully nest here.
Ethical Birder 
I am continually amazed and impressed with your bird sightings, John!
I would love to be able to scope out the variety you always seem to observe 🙂