Winter drag Yellow-rumps

I saw these Yellow-rumped Warlbers a week ago in the Florence River Park in Florence,CO. They were part of a small flock feeding in Russian Olive trees. Most were in their winter (Basic) plumage as these were and all were of the Myrtle subspecies, which is fairly common along the Arkansas River corridor but not seen very often in other parts of Colorado. A few Yellow-rumps generally overwinter in the Canon City/Florence area as well as other areas further east along the Arkansas River. SeEtta