Everybody knows that elephants trumpet. Over the past decades research at the University of Vienna has mainly studied the elephants’ low-frequency rumble. Its fundamental frequency reaches into the infrasonic range below the human hearing threshold. This call is produced by the elephant´s massive vocal folds. Much less was known about how elephants produce their higher pitched sounds, the trumpets and squeaks.
Click here for original story, Asian elephants shown to ‘buzz’ their lips to squeak
Source: Phys.org