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(a) Mean (±s.e.) number of red crumbs attacked in trial 8−number of red crumbs attacked in trial 7 in experiment 2 (n=14 for each group). (b) Mean (±s.e.) number of green crumbs attacked before a red in trial 7−number of green crumbs attacked before a red in trial 8 in experiment 2 (n=14 for each group).
