"What is it, Brian?" Trixie asked.
"Bats. Thousands of them. They're asleep. Gosh!"
The startled bats roared into flight, circling the cave clockwise and beating against the Bob-Whites, almost knocking them down. The girls waved their arms wildly and ran out of the cave. Slim, pushing the girls aside, ran ahead of them.
The whirring wings of the frenzied bats sounded like the roar of an express train....
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