Why do bats hang upside down?

Bats sleep upside down because that’s the easiest position for them to take flight from. Bat wings can’t generate enough lift to get airborne from an upright position. The wings are made of skin stretched between elongated fingers and are very fragile. The most effective way for a bat to take flight is to drop from above, so they have adapted to hang from their feet.

Bat wing

 

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Images from
flickr.com/photos/ileohidalgo
flickr.com/photos/usfwshq