Gary,
Could be warbling vireo. The dark cap and bright eyebrow also make me think about red eyed vireo (we saw one singing vigorously at Castlewood earlier this month).
Cheryl Teuton
The photos were taken in Park county, a little off of 285 between Jefferson and Fairplay. It is mostly aspen with a few scattered pine, on a fairly dry hillside. After looking through books my first thought was the gnatcatcher too just based on co...
Thanks for the replies! I really apreciate it. As far as I can tell it isn't a nuthatch, I have another picture maybe that will help. The picture was taken in Park county last week.