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Correlation between keystone boldness index and number of attackers for all trials. Correlation coefficient (±95% CI) of the relationship between the boldness index of the keystone individual and the number of attackers during the five collective prey capture assays of colonies from which a bold keystone (a) or a control shy (b) individual were removed after 5 (white), 10 (grey) or 20 (black) days (n = 30 colonies for each treatment).
