Drawings of 2 Experimental Conditions (IMAGE) PLOS Caption Figure 1. Drawings of the two experimental conditions. 1) full model condition; 2) water bottle condition. Squares in lower right corners represent drinkers. Chimpanzees on the left: subjects. Chimpanzees on the right: demonstrator or stooge (depending on condition). Please note that, for clarity reasons, most bars of the caging have been omitted from the drawing. doi:10.1371/journal.pone.0010544.g001 Credit Figure 1 from a manuscript by Tennie et al; PLoS ONE 5(5): e10544 Usage Restrictions Free to use and distribute as long as authors and journal are credited License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.