First of all, bats are blind at night and rely on getting around by sending out high pitch sounds and listen for the response by echo.
"the results indicated that bats obey their own intriguing set of 'traffic rules': they chase each other, perform tandem turns and even slow down to avoid collision."When there is a bat close enough for the bio-sonar to read it, the bat following the other bat will adapt and follow what the leading bat is doing. This is kinda similar to human cars on a street; usually when you're behind someone in a car, you tend to go the same speed. It's fascinating to know how similar other animals are connected to others.
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