It's not uncommon to see small family groups of Chimney Swifts overhead during the summer months. Wonderful fliers, catching bugs on the wing.
I've seen parents pass a bug to a child, both on the wing. Cute.
Their numbers have declined drastically over the past 40 years, for unclear reasons. Maybe more chimney caps, or steel flues. They need masonry flues to get a grip.
My best Chimney Swift story is about the day one accidentally came down our old church's chimney and started flying around the church - on Pentecost! I finally was able to snatch it when it was banging against the window, and somebody opened the window and off it went like the Holy Spirit.
There are a couple of other species of Swifts in the western US. If anybody can distinguish a Vaux from a Chimney Swift, good for you. Swifts spend the cooler months in the Amazon basin.