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The Austin sky explodes as 1.5 million Mexican free-tail bats provide a spectacular show as they exit the Congress Avenue Bridge for their nightly feeding.jpg
Austin's bridge bats are Mexican free-tailed bats. They migrate each spring from central Mexico to various roosting sites throughout the southwestern U.S. Most of the colony is female, and in early June each one gives birth to a single baby bat, called a pup. At birth the babies weigh one-third as much as their mothers (the equivalent of a human giving birth to a 40-pound child!).

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