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Do Chimpanzees Use Weight to Select Hammer Tools?

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Figure

Figure 1. A chimpanzee using a cuboid-shaped hammer to crack open a nut in a pit of the anvil.doi:10.1371/journal.pone.0041044.g001
Table 3 presents the frequency of
Table 1. Average number of strikes (6SE) needed to solution for all subjects as a function of hammer weight in Experiment 1.
Table 2. Average time (6SE) to solution for all subjects as a function of hammer weight.
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