The Bat Vortex

The Bat Vortex, a photo by Joe Rocchio on Flickr.

Via Flickr:
During spring and summer evenings, 20 million bats emerge from Bracken Cave (north of San Antonio, TX). They fly out of the cave in a spiral flight pattern. This bat colony is the largest congregation of mammals in the world. Watching them emerge is an absolutely amazing experience. Kudos to Bat Conservation International for protecting this and other bat colonies.

www.batcon.org/index.php/get-involved/visit-a-bat-locatio...