Goldfinch?
A "record shot". The bird moved away before I could focus. Included here for hard-core birders -- even though they have seen much better photos. Phaenopepla Tree, Road F, Jasper Ridge Biological Preserve. 9/28/2021, 8:40:41 am. This is not all: separate galleries are nearby, for a hybrid Sapsucker and a White-breasted Nuthatch, also in this tree on this morning.