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Using the Aesop's Fable Paradigm to Investigate Causal Understanding of Water Displacement by New Caledonian Crows

Figure 3

Changes in mean performance over the course of each experiment.

Each panel gives the mean percent correct choices over trials 1–5, trials 6–10, 11–15 and 16–20, in each experiment, to indicate changes in performance over the course of 20 trials. (A: Sand v Water, B: Sinking v Floating, C: Solid v Hollow, D: Narrow v Wide, E: High v Low water level, F: U-tube.) Error bars are ±2 SE.

Figure 3

doi: https://doi.org/10.1371/journal.pone.0092895.g003