On March 27, I saw one lone swift flying above Pinole Ridge. I was fairly sure that's what it was but not used to seeing them and since I only sighted one I put a question mark in my notes.
However, yesterday at Crockett Hills and today at Hilltop Lake I saw four swifts flying overhead at each location. I believe these were all Vaux's swifts but, as I say, not used to seeing them.