0Smart ElephantsWe know they never forget—but can they talk? 60 Minutes correspondent Bob Simon goes deep into the rainforest, where scientists have discovered elephants who speak in voices humans can’t even hear.Updated Apr. 25, 2017 11:20AM EDT / Published Dec. 31, 2009 9:48AM EST Paul Sakuma / AP Photo Paul Sakuma / AP Photo Roberto Pfeil / AP Photo Stacie McChesney / NBCU Photo Bank Roberto Pfeil / AP Photo Kimimasa Mayama / Reuters Newscom Fredrick D. Joe / AP Photo Ina Fassbender / Landov / Reuters Newscom Tarmizy Harva / Reuters Colin Davey / Evening Standard / Getty Images
Paul Sakuma / AP Photo Roberto Pfeil / AP Photo Stacie McChesney / NBCU Photo Bank Roberto Pfeil / AP Photo Kimimasa Mayama / Reuters Newscom Fredrick D. Joe / AP Photo Ina Fassbender / Landov / Reuters Newscom Tarmizy Harva / Reuters Colin Davey / Evening Standard / Getty Images