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Experiment 2(i)—Female receptivity and occurrence of leg vibration. The effect of female strains was examined by a likelihood ratio test (GLM with binomial distribution). (a) Proportion of pairs that copulated within the observation period (χ2 = 113.41, d.f. = 1, p < 0.001). (b) Proportion of pairs in which males performed leg vibration within 1 min before copulation among the successfully copulating pairs (χ2 = 18.217, d.f. = 1, p < 0.001).
