Maybe the xbill researchers should be checking out the xbill bills to
see what bill shapes are best at opening what type cones. Or maybe they
are...
https://www.sciencenews.org/article/how-bird-feeders-may-be-changing-great-tits-beaks
When the big red xbill irruption happened here a few years back, we had
xbills all over our doug firs here in SW Yamhill County... the firs were
loaded with cones that year. I think Dave is onto something... birds eat
what's available... :-)
Linda Fink
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