Preliminary Investigation on Communication Behavior of Rhesus Monkey Macaca mulatta in Filed

This paper report the preliminary investigation on communication behavior of rhesus monkey in field.The macaques were relaxed on normal state,and sometimes they made a kind of normal call.The call of adult female was "hè" with max vibrating peak frequency Fmax being 900 Hz,and the call of infant was "ēn" with Fmax being 1000 Hz.The frightened call of adult female and infant was "kě" and "giè" with Fmax being 550 Hz and 350 Hz.The frightened female monkey opened her eyes wide and her facial expression was nervous.Comparing with normal call,the range of best frequency BF was smaller,Fmax was lower,and the time of one syllable was shoter in frightened call.