Actually, I think I pinned the ID on this guy, but I would really love some back-up:
Photos were taken at St. Sebastian River State Preserve, east central Florida, yesterday. As for behavior, they were (presumably) feeding on the ground in a flock of maybe a dozen (?) and flew into the pine tree when I walked by. I didn’t see them in the brush off the path, so I can only assume they were foraging, as were some couple hundred Pine and Palm Warblers and Eastern Bluebirds in that general area shortly thereafter.
Thanks for any help.