It is a spring and summer tradition to go watch the bats come out at dusk here. There are several bridges that cover dry washes- where thousands of bats are sleeping each day and at dusk they come out and fly off to feast the night away on insects and the like! The first pictures shows them flying out toward the Catalina Mountains. The other is a shot of them emerging from under the bridge. Put it on your list of must see's when you visit Tucson!