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Modifications to the Aesop's Fable Paradigm Change New Caledonian Crow Performances

Figure 4

Objects used: top pair = stones, second pair = eraser/polystyrene for sinking vs. floating, third pair = solid/hollow, bottom pair = eraser/fimo clay for wide vs. narrow.

Figure 4

doi: https://doi.org/10.1371/journal.pone.0103049.g004