It's that time of year that the quantities and varieties of birds really start to decline...in other words, the birding is slow. Seeing ten species at Avimor in an hour is impressive this time of year compared to spring when it is easy to chalk up 25 or more.
Another interesting phenomenon is the lack of birds at feeders right now. I am getting occasional House Finches and Dark-eyed Juncos, but that is about it. The thistle seed feeder that usually always hosts American Goldfinch has sat untouched for a few weeks now. There must be plenty of natural forage still in the riparian draws and hills. Once they have gleaned all the seeds they can and the bugs disappear with the oncoming cold and frost, I'm sure a greater variety of birds will be taking advantage of the nutrient-rich and easily accessible food at feeders.