recommendation by goose
The largest urban colony of bats lives on the underbelly of a downtown Austin bridge, and come sunset you can spread out a blanket on an expanse of grass nearby to watch them come out, or stand on the bridge and watch them come out. The bats earn their keep by eating tons of insects everynight. Austin has found a cool and green way to keep the insects under control, and it's a really impressive thing to watch as black clouds of bats emerge from under the bridge.
Congress Ave over Ladybird Lake