Texas Wild filmed this last night, Oct 6th, at a cave in Edwards County. This video begins with swarms of cave swallows outside and then swirling inside the cave as a rainstorm passes. The swallows nest inside the caves with large numbers of free-tailed bats. Then you will see swirls of Brazilian free-tailed bats followed by a weak exit flight. The strongest cold front of the year accompanied us from Canyon to near Sonora and, along with the rain, likely slowed the emergence. We use ir lights to film the bats because visible light disturbs bats. This series of events occurs at caves across south Texas from April-October. Both species are excellent at insect control.