Smells familiar: group-joining decisions of predatory mites are mediated by olfactory cues of social familiarity.

persimilis females had a highly significant preference for joining the familiar group (Wilcoxon signed-ranks tests: P ≤ 0.001 for each prey ratio; balanced: N = 30, Z = −3.435; slightly biased to unfamiliar: N = 20, Z = −3.578; slightly biased to familiar: N = 20, Z = −4.025; moderately biased to unfamiliar: N = 20, Z = −3.578; moderately biased to familiar: N = 20, Z = −4.025; strongly biased to unfamiliar: N = 20, Z = −3.628; strongly biased to familiar: N = 20, Z = −4.025; Fig. 2 ).

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