Bat Night is a yearly environmental performance art event produced by the Rillito River Project and held in Tucson Arizona under the Campbell Avenue bridge. This bridge spans the Rillito River, which once had water flowing in it year round. Human settlement over the last century has left the river dry, endangering many of the species that relied on the river for their water and habitat.
The Campbell avenue bridge also features a dramatic, nightly flight of bats that live in the expansion joints of the structure. Using the spectacle of thousands of bats taking flight, The Rillito River Project has created Bat Night, drawing thousands of people into a dry river bed to not only enjoy the flight of the bats but to view dance and musical performances that entertain and speakers to educate on the environmental issues facing the Southwest.