My grandparents grew filberts in the n. Willamette Valley in the 1930s and 40s.
Compare changes in C. Scrub Jay to changes in Acorn Woodpecker and
White-breasted Nuthatch. Both of the latter are much less common and more local
around Eugene than they were in the late 1960s. I have not looked at CBC data
but I would think this change would appear there. The nuthatch seems to be a
bit more flexible in habitat use.
Alan Contreras
Eugene, Oregon
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