I stepped outside of my camper about an hour ago and noticed some birds flitting around in the pines up the hill. Grabbed the binos and went up there, with a few minutes I saw: RB Nuthatch, WB Nuthatch, 2 Pygmy Nuthatch, BC Chickadee, Brown Creeper, WW Junco, Red Crossbills, Mountain Bluebirds, Western Wood-Pewee, YR Warbler, and most intriguing, a Solitary-type vireo that was quite yellow on the flanks, I could not get a very good view and only a quick look, but the head/throat contrast appeared more like Cassin's than the other two. I raced back to the truck to get my camera but never saw the vireo again. I've seen some fall Plumbeous Vireos with very faint yellow on the flanks, but not as much as this bird. I think finding this flock again would require a lot of luck, but I will be looking. I'm about 5 miles WSW of Jewel Cave in Custer County. Anyone interested, email me for specific directions.
Interestingly, this is the second time in the last couple of weeks I've seen Pygmy Nuthatches in a mixed flock like this.