Chimpanzees appear ‘capable’ of human speech in remarkable resurfaced videos, researchers reveal New York Post Chimpanzee utterances refute purported missing links for novel vocalizations and syllabic speech | Scientific Reports Nature.comOld videos of chimpanzees suggest they are capable of speech Phys.orgScientists delve into the give-and-take of chimp conversations The Washington PostThe Chimps Who Learned to Say ‘Mama’ The New York Times