There are a few reasons:
First, bats need to fall in the air to begin flying; they can’t just begin to fly while standing upright, since their wings don’t provide enough lift. When they are upside down, they can easily let go to begin flight.
Second, bats actually expend very little energy by hanging upside down-this is their most relaxed position. Bats have to exert much more energy to stand upright.
Roosting upside down also helps in that it keeps bats from competing with “upright” creatures for places to rest.
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