Male chacma baboons (Papio hamadryas ursinus) discriminate loud call contests between rivals of different relative ranks
Animal Cognition (2005) - Comment
pubmed: 15164259  doi: 10.1007/s10071-004-0222-2  issn: 1435-9448  issn: 1435-9456 

Dawn M. Kitchen, Dorothy L. Cheney, Robert M. Seyfarth