Compared to other dolphins, the Irrawaddy is distinctive through its round face, short beak, and a bulging forehead that makes it look more similar to a whale.
The species eats crustaceans and fish found in tropical and subtropical estuaries. They are rarely seen alone and are always socially feeding and swimming in groups in semi-marine environment, usually near the shore or close to mangrove forests, but most populations are found in freshwater or brackish areas like rivers, deltas, lakes, and bays.
Malampaya Sound, Philippines: 77
Mekong River: 78-91
Mahakam River, Indonesia: 87
Ayeyarwady River, Myanmar: 58-72
Coastal waters of Bangladesh: 5,383
Sundarbans mangrove forest of Bangladesh: 451