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Irrawaddy dolphin (Orcaella brevirostris) is a euryhaline dolphin species that inhabits both marine and freshwater ecosystems in South and Southeast Asia. First described from the Ayeyarwady River in Myanmar, this species today occurs in small and isolated populations in coastal areas, estuaries, and particularly in river systems such as the Mekong, Mahakam, and Ayeyarwady. Although the species as a whole is generally considered threatened, its freshwater populations are at critical risk of exti