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The distribution of Z-scores from the runs test analyses for (A) gnawing and (B) scent-marking across all morning (white), midday (gray), and afternoon (black) testing sessions. The dotted line indicates the threshold for significant temporal clumping within a session (Z < −1.960, P < 0.05). This was breached 26 times for gnawing, and 19 times for scent-marking.
