Photo from Wikimedia Commons, taken by National Park Service.
The Austin-based Driftwood Association is hosting a "Swift Night Out" the weekend of August 6, 7, 8. Chimney Swifts are among my favorite birds; our chimney swift tower at Wild Bird Rescue hosts a breeding pair every year.
The Swift Night Out is a project to collect information on chimney swifts. If you have some time, consider participating, especially if you are lucky enough to have a roost in your chimney.