This Monograph reports a series of ten studies on the social-cognitive abilities of three young chimpanzees, ages to four years.

• Compares outcomes to similar studies conducted on human infacts for a comparative understanding.
  
• Looks at chimpanzees' abilities to understand and imitate goal-directed actions.
  
• Results suggest that the ontogeny of human social cognition comprises two relatively distinct trajectories: one for understanding intentional action and perception, common to all apes, and another for sharing psychological...