Austin, Texas story
The Night the Sky Comes Alive
The incredible story of how 1.5 million Mexican free-tailed bats made a downtown bridge their home.
Read the story
As the sun begins to dip below the Austin horizon, crowds gather along the water, waiting for one of the most spectacular natural shows on Earth. Underneath the Ann W. Richards Congress Avenue Bridge lives the world’s largest urban bat colony.
Every year, during the warm summer months, about 1.5 million Mexican free-tailed bats make this bridge their home. This massive maternity colony is mostly female, and each June, the mothers give birth to a single pup, raising an estimated 750,000 pups right here in the heart of downtown. This phenomenon started in the early 1980s after a bridge renovation created the perfect narrow crevices for roosting.
At first, residents were uneasy, but today, the bats are beloved local icons. At dusk, they stream out in a breathtaking, swirling cloud to forage for flying insects across the Texas sky. It is a stunning reminder of the wild, untamed spirit that thrives right in the middle of our bustling city.
Updated June 2026