Geographical Distribution
​The Irrawaddy dolphins is a euryhaline species of oceanic dolphin found in patchily distribution throughout freshwater and coastal areas and is not found in offshore waters. This species is found throughout the Indo-Pacific region, occurring from the Philippines to northeastern India. The Irrawaddy dolphin is found in Mahakam, Ayeyarwady and Mekong River systems. It is also known to live in Chika Lake in India as well as Songkhla Lake in Thailand. There are fewer than 250 freshwater Irrawaddy dolphins left in the three river basins where they are found. 

General information 
​​The Irrawaddy dolphins have a polygynous mating system, though little is known about its reproductive biology. It is believed to breed between December and June, with an average gestation period of 9 to 14 months. Females give birth to a single calf every 2-3 years. During the first seven months of its life, the calf relies entirely on its mother for nutrition. These dolphins are thought to reach reproductive maturity between 7 and 9 years of age. Groups of Irrawaddy dolphins are relatively small, usually consisting of 3 to 6 individuals. While not very active, they are social within their pods and occasionally interact with other pods. They inhabit muddy, brackish waters, particularly near river mouths and deltas, where they feed on a variety of fishes. Although their diet primarily consists of fish, they are partial to bony fish and fish eggs and also consume crustaceans as a secondary food source.

Threats 
-Habitat degradation and population fragmentation.
-Water pollution or water poisoning, contamination due to gold mining.
-Collisions with boats, getting caught or drowning in fishing nets.
-Illegal fishing methods such as electrofishing.
-Land use changes for palm oil plantation, global warming, climate changes and construction of dams.