Tourists and local residents gather on t

AUSTIN, UNITED STATES: Tourists and local residents gather on the Congress Avenue Bridge 10 June, 2005 in Austin, Texas to watch aa colony of approximately 1.5 million Mexican free-tailed bats swoop into the skies in search of their evening meal from their home at the largest urban bat colony in North America. The bats under the Congress Avenue Bridge consume some 10,000 to 30,000 pounds (4,536-13,608 kilos) of bugs every night and bring in about eight million USD in tourist revenue every year from the nearly 100,000 people who visit the bat colony each summer. AFP PHOTO/JEFF HAYNES (Photo credit should read JEFF HAYNES/AFP via Getty Images)