That means they have to leave home earlier than usual each night to find nourishment — giving the locals in this bat-crazy city a precious few more minutes to watch the normally-nocturnal critters fly before the sun goes down.
Each night they stream from under a bridge by the hundreds of thousands in a black cloud so large that it shows up on local weather radar.
"It's wonderful for people to be able to see them, and they are really spectacular," said James Eggers, director of education for the Austin-based Bat Conservation International. "But it's an indicator that things are a little tougher for the bats."
We hope the bats are doing ok, especially since 2011-2012 has been declared the Year of the Bat by the United Nations.
In Texas, high school football is nearly a religion, highlighted by a television drama series "Friday Night Lights" that follows the lives of a Texas high school football team and its entourage.
In the real thing, the key to survival in the heat is water, and plenty of it, according to veteran San Antonio high school athletic trainer Paul 'Doc' Rost.
"Basically right now we have hydration stations set out where a kid can go at any time and get a drink," Rost said. "I tell 'em, if you're thirsty when you get out here, you're dehydrated already."