CIMG7473 Town Lake at night
All these boats are parked at the Congress Avenue bridge to watch the bats coming out at dusk.
On September 22rd, 2007, the members of Atheist Community of Austin went on a now-annual cruise on Town Lake, and watched the bats emerge at dusk from the Congress Avenue bridge.
Here are my pictures from the other bat cruises:
Bat cruise of 2006
Bat cruise of 2008
Bat cruise of 2013, with P. Z. Myers as a special guest.