| Birds | Chimney Swift Chaetura pelagica    Copyright David Seibel, 2013 (#7138) | Send Comment Camera: Canon EOS-1D Mark IV Exposure: 1/250 sec, f/7.1, ISO 3200 Lens: Canon 500mm f/4L IS Date: September 15, 2013 Location: Overland Park, Kansas, USA Description: Part of a flock of well over 1,000 birds preparing to enter their nocturnal roost inside a large chimney.