Chimpanzees help trace the evolution of human speech back to ancient ancestors Phys.orgChimps Smack Their Lips in Rhythms Uncannily Similar to Human Language ScienceAlertHuman speech evolved from chimpanzee 'lip smacking', says new study Telegraph.co.ukChimp lip smacking could solve mystery of human speech evolution Sky NewsLip-smacking chimps show hint of language | News The TimesView Full Coverage on Google News