To investigate whether advertisement calls with different notes replaced by noise affect male competition, we carried out male‐evoked vocal response experiments. The acoustic stimuli (AC, AN2, AN3, and AN4) were broadcast in a random order using a speaker (SME‐AFS, Saul Mineroff Electronics) at 1 m away from the enclosure. Prior to testing each subject, each stimulus was calibrated to 80 dB SPL (re 20 µPa, Z‐weighted) using a sound level meter (AWA 6,291; Hangzhou Aihua Instruments Co.). We recorded spontaneous calls for 3 min in a quiet environment (abbreviated as “S”) using a sound recorder (R6822; Aigo Digital Technology Co. Ltd.). Then, we randomly played back the stimuli (AC, AN2, AN3, AN4) for 3 min and recorded male‐evoked vocal responses during each playback period. The interval between each stimulus was 3 min. We analyzed the vocalization parameters of spontaneous calls and evoked calls during each playback period. Males who failed to vocalize spontaneously were excluded from our experiments. After experiments, males were measured (snout–vent length: 33.58 ± 1.35 mm, N = 41; body mass: 2.03 ± 0.21 g, N = 41).

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