Move over birds, some bats sing just as beautifully. The common perception of bat calls consists of only squeaks and high-pitched echolocation chirps. But many bats, including the famed Mexican free-tailed bats of Austin, TX, actually sing lovely songs to one another. As with birds, bats sing to find mates, warn rivals, and claim territories. Unlike birds, however, nobody expects mammals to sing (with the exception of whales and karaoke aficionados). Are there others?
