info:oai:sro.sussex.ac.uk:13565info:ofi/fmt:xml:xsd:bookHopkinsWilliam DHopkins, William DTaglialatelaJ. P.Taglialatela, J. P.LeavensDavidLeavens, David1 March 20119789027204547Do chimpanzees have voluntary control of their facial expressions and vocalizations?Primate communication and human language : vocalisation, gestures, imitation and deixis in humans and non-humans20bookitem