The Irrawaddy Dolphin (Orcaella brevirostris) is a euryhaline species of Oceanic dolphin found in discontinuous sub-populations near sea coasts and in estuaries and rivers in parts of the Bay of Bengal and Southeast Asia. irrawaddy, irrawaddy dolphin, burundi, sperm whales, yangtze river dolphin Irrawaddy dolphins are similar to the Beluga in appearance, though most closely related to the Orca also known as killer whales.
bangladesh from spaceThough the fate of the world's dolphins and porpoises living in rivers and in brackish coastal waters is categorically dire—the baiji in the Yangtze River has been pushed to extinction by expanding human populations;
Bangladesh clearly serves as an important sanctuary for Irrawaddy dolphins, and conservation in this region should be a top priority.

NASA The maze-like coast of Bangladesh is a haven for river dolphins, but fishing nets and disrupted water flows from upriver dams pose threats.
Wildlife Conservation Society and Chittagong University in Bangladesh estimate that the region is home to 6,000 of the dolphins, by far the largest known population.
the rarest thing in nature these days is abundance. So it’s worth celebrating this survey in Bangladesh.