Irrawaddy Dolphin
Irrawaddy dolphins in Sundarbans channels — how to look, how to avoid harm, and what to expect.
Last updated
Orcaella brevirostris · IUCN Endangered
A rounded head breaks the surface, breathes once, and disappears behind a mangrove point. Orcaella brevirostris is not a leaping show animal. It is a brackish-water specialist sharing channels with prawn nets, cargo boats, and tourist launches.
Behaviour
Irrawaddy dolphins often travel in small groups. They may spy-hop or surface near boats that keep steady, slow speed. Sudden acceleration, prop noise, and crowding stress them. Finless porpoise (Neophocaena phocaenoides) sometimes appears in the same estuaries — smaller, shy, easy to miss.
Conservation context
Globally Endangered, with fragmented populations across South and Southeast Asia. Entanglement, habitat change, and vessel strikes are ongoing risks. STR patrol and ecotourism regulation aim to reduce harm, but dolphins still die in nets outside tourism hours.
How to be a good guest
- Ask your operator whether dolphins are known on your route — without demanding a chase.
- Stay seated when the crew cuts the engine for a sighting.
- Do not throw food or plastic overboard.
Frequently asked questions
- Are dolphin sightings guaranteed on Sundarbans tours?
- No. Dolphins use quieter stretches away from the busiest tower traffic. Some routes and seasons are better than others. Ethical crews slow or idle when animals surface nearby; they do not chase pods for tips.
- What is the difference between Irrawaddy dolphin and finless porpoise?
- Irrawaddy dolphins have a rounded forehead and visible dorsal fin. Finless porpoises are smaller and lack a prominent fin. Both occur in Indian Sundarbans estuaries; neither is a performing aquarium dolphin.