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Limited information is available about the Indus river dolphin acoustics in the wild. Such study is important in the light of its endangered status. This work studies echolocation behaviour of free-ranging Indus river dolphin in the wild compares its echolocation behaviour with the Ganges river dolphin and also discusses its presence around the barrages. In order to carry out this study, T-PODs were deployed over the period of 38 days at three sites namely Spur-30, Kehiri-Bund and Guddu barrage (from 27-01-2008 to 18-04-2008). Analysis was performed using T-POD software. CET-ALL clicks are selected for the analysis using modified click selection criteria as mentioned in (Elliott et al., 2012). CET-ALL click train follows these characteristics; on average 108 us click duration, 37 clicks per second, 9 to 30 clicks per train and 3.2 ms mean inter click interval (ICI). Indus river dolphin exhibits different acoustic characteristic as compared to Ganges river dolphin, in terms of click durations, ICI and dominant frequency. Moreover, acoustic detections suggest potential of Indus river dolphin occurrence near the barrages.
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