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Why do Bats turn left when they leave a cave?



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Clearly not all caves have a 'left' hand exit option and it is therefore laughable to suggest that all bats bear left when departing their caves. The idea that thousands of bats would ever try and leave a cave simultaneously is also not a given, although it has been known to occur.

On a recent study of bats living in a mountainous area in the Congo region, it was established that bats living in a particularly tight knit group of caves, where entry to and exit from the caves was severely restricted, operated a strict 'one in one out' system, often with no left exit option for the bats to take. It would seem that at the end of the day, every bat is different and there are no hard and fast rules as to how bats leave their caves.