n the depths of the caves, where current airs, temperature and humidity are practically constant, bats seem to know exactly when it's time to go hunting. In fact, when atmospheric pressure decreases (before a rainfall), the insects gather at low altitude and are easier to be preyed. The atmospheric pressure varies both inside and outside the grottoes inhabited by bats. Bats know that low atmospheric pressure means more food and they can even detect these variations with the help of a sensory organ placed in the middle ear that only bats and birds possess.
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