Bats
At dusk from about mid-March through October, up to 1.5 million Mexican free-tailed bats stream out from under Austin's Ann W. Richards Congress Avenue Bridge - the largest urban bat colony in the world - and it's free to watch from the bridge or the lakeshore. For the ultimate version, Bracken Cave near San Antonio holds the largest bat colony in the world (15-20 million bats, protected by Bat Conservation International, viewing by reservation). Clarity Tunnel at Caprock Canyons is a third great spot. Heads up: a bat emergence is never guaranteed - cold, wind, or rain changes the timing - so check the site's info before you go.
TPWD Bat-Watching Sites of Texas ->