The experimenter introduced the three tools inside the compartments so that Gal, an adult male, could freely manipulate them. Only one of the three tools, the flexible one, is useful to reach the yogurt in the baited apparatus, a tube presenting an angle of approximately 90°. Once Gal stopped manipulating the tools, they were retrieved and placed on their preassigned location on the sliding platform. After Gal chose one of the three tools, the experimenter gave the selected tool to him and allowed him to move to the baited tube.
Info Gloria Sabbatini Unit of Cognitive Primatology, ISTC-CNR, Rome
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