Chimpanzees Recruit the Best Collaborators
Alicia P. Melis, Brian Hare, Michael Tomasello

Supporting Online Material

This supplement contains:
Materials and Methods
Figs. S1 and S2
Table S1
References
Movie S1

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Movie S1
In the collaboration condition of experiment 1, the two ends of the rope are too far apart for one individual to pull both simultaneously. The subject (who enters the room from the left side) releases the partner locked in the back room and then both pull the baited tray within reach together. In the solo condition of experiment 1, the subject does not release the partner, because the two ends of the rope are close enough to be pulled by himself. In the introduction session of experiment 2, subjects do not have a preference for either potential partner, occasionally choosing the less effective one, with whom they are very often unsuccessful obtaining the food tray. In the test session of experiment 2, subjects preferentially choose the effective partner and are able to obtain the food tray.

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