troglodytes) gestures to obtain food. The chimpanzees received 1 trial per condition. In
Experiment 1 (N= 101), in full view of the chimpanzee, a banana was placed on top of 1 of 2
inverted buckets or was hidden underneath 1 of the buckets. In Experiment 2 (N= 35), 4
conditions were presented in constant order:(a) no food, no observer;(b) no food, observer
present;(c) food present, no observer; and (d) food present, observer present. Gestures and …