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Fig. 2. Phonotaxis score (mean ± S.E.M.; N=9 each) of female N. robustus (A) and N. bivocatus (B) in response to the model of the conspecific call (left bar) and to an unmodulated sine wave (right bar). Asterisk indicates a significant difference from the corresponding conspecific call model (P<0.05, Mann–Whitney U-test).