1. Children, but Not Chimpanzees, Prefer to Collaborate
Yvonne Rekers, Daniel B.M. Haun, Michael Tomasello 
Current Biology 
Volume 21, Issue 20, Pages (October 2011)
DOI: /j.cub
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2. Figure 1 Experimental setup for chimpanzees in study 1
Current Biology  , DOI: ( /j.cub )
Copyright © 2011 Elsevier Ltd Terms and Conditions

3. Figure 2
The Percentage of Trials of Study 1 and Study 2 in which the Subjects Chose the Collaborative Board
Error bars indicate standard error of the mean.
Current Biology  , DOI: ( /j.cub )
Copyright © 2011 Elsevier Ltd Terms and Conditions