Around March every year about 750,000 bats (mostly pregnant females) migrate to Austin, where they roost under the Congress Avenue Bridge downtown. By about August they double in number because all the momma bats have babies. That's 1.5 million bats! It's the biggest urban bat colony in the U.S. Around sunset every night they emerge from under the bridge to hunt for insects, and it's quite a sight. Hundreds of people line the bridge, with hundreds watching from Lady Bird Lake below (think several cruise boats and lots of kayaks), and even more people watch from the shore. There were at least several hundred people there last night. Anyway, the Congress Avenue Bridge is one of Austin's big tourist attractions.
We didn't get any pictures of the bats (we had to go take our babysitters home), but you can see the people lined up along the bridge with the Austin skyline all lit up in the background:


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