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Spectrograms of representative calls of an adult male (A) and of a juvenile (B) Mongolian gazelle. Call duration is about 0.25 s in both cases. In the calls of adult males (n = 41) the lowest-frequency band averages 500 Hz. Possibly the noisy parts in A are indicative of non-linear phenomena. In the calls of juveniles (n = 21) the lowest-frequency band is ∼790 Hz.
