In one corner of the basement of Ames Hall at the Johns Hopkins University, Cynthia Moss opened the door of a room where about a dozen Egyptian fruit bats dozed inside a milk crate attached to the ...

P. kuhlii above a spectrogram of its echolocation sequence. Source: Eran Amichai, used with permission. Many bats navigate using echolocation—emitting high-frequency sound pulses and analyzing the ...