Chimpanzee Vocal Signaling Points to a Multimodal Origin of Human Language Taglialatela, Jared P. ; Russell, Jamie L. ; Schaeffer, Jennifer A. ; Hopkins, William D. Abstract Publication: PLoS ONE Pub Date: April 2011 DOI: 10.1371/journal.pone.0018852 Bibcode: 2011PLoSO...618852T