Every evening in the summer and fall millions of Mexican free-tail bats take flight from the Congress Avenue bridge in Austin. They have become a tourism magnet, drawing hundreds of people to witness the nightly event. Many watch from the bridge. Others watch from party boats floating in the Colorado River. Some come in their kayaks, canoes and paddle boards.
By most estimates there are somewhere between a million and a half, and two million bats, swarming out from under the bridge, heading out to forage for food. Nearly all are female, and young pups. They have been drawing visitors to the bridge for decades.
Check the video below, taken from my kayak in the Colorado River.