I am out looking for birds in urban Bellingham several days a week and have
yet to see a Townsend's Warbler this winter (some other birder here at WWU told
me that she had one outside her window). All of the Yellow-rumps I have seen are
singles and I check every chickadee flock. In great contrast, it is common in
the San francisco Bay Area to find winter flocks containing several warbler
species and in some areas (urban Pacific Grove) there are often flocks with five
or more species. Clark blake, Dept. Geology,WWU Bellingham, WA 98225