These birds seem to raise a great heap of interest when the question of range expansion is raised. Last spring an article on the issue was posted for the Oregon birding community by Greg Gilson.

http://nwbackyardbirder.blogspot.com/2012/07/wrentits-in-northern-willamette-valley.html

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Clay
Sherwood, Oregon
Smile, have a beer, watch Doc Martin on OPB, identify the gulls.