Irrawaddy dolphin - Orcaella brevirostris
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The Irrawaddy dolphin (Orcaella brevirostris) is a species of oceanic dolphin found in scattered subpopulations near sea coasts and in estuaries and rivers in parts of the Bay of Bengal and Southeast Asia. It is a euryhaline species, meaning it can live in both saltwater and freshwater environments. Three discrete riverine populations occur in the Mekong, Mahakam, and Ayeyarwady rivers.