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While searching for prey, Molossus molossus broadcasts narrow-band calls of 11.42ms organized in pairs of pulses that alternate in frequency. The first signal of the pair is at 34.5kHz, the second at 39.6kHz. Pairs of calls with changing frequencies were only emitted when the interpulse intervals were below 200ms. Maximum duty cycles during search phase are close to 20%. Frequency alternation of search...