When bats aren't flying, they often dangle from cave ceilings or the undersides of bridges. But why do bats sleep upside down? This topsy-turvy behavior may result from the evolutionary journey bats ...

Most library-goers don’t get to enjoy a bit of nature while pursuing books; not so for Portugal’s Joanine Library. A colony of bats has called the library home since the 18th century. The fascinating ...