The Indus and Ganges river dolphins are so alike that scientists treated them as a single species for decades. Both are blind, both have long tooth-lined beaks, and both haunt the muddy rivers of South Asia. Yet in 2021 researchers concluded they are in fact two distinct species. Here is what separates them. For a deeper profile of the Indus animal, see our Indus River dolphin species guide.
They were split into two species in 2021
A taxonomic revision published in 2021 examined skulls, body measurements and DNA and found the two populations had been reproductively and geographically isolated for roughly half a million years. The Indus dolphin was elevated to its own species, Platanista minor, separate from the Ganges dolphin, Platanista gangetica.
The evidence behind the split
- Skull shape: the frontal bones behind the nasal openings differ consistently between the two, regardless of an animal's age, sex or size.
- Genetics: the two river systems share no mitochondrial DNA haplotypes, with fixed genetic differences pointing to long-term separation.
- Other traits: the species also differ in tooth counts, coloration and growth patterns.
Different rivers, different names
The Indus River dolphin, or bhulan, lives in Pakistan's Indus system. The Ganges River dolphin, called susu or shushuk, ranges across the Ganges-Brahmaputra-Meghna system in India, Bangladesh and Nepal. Their ranges do not overlap.
What they share
Both are functionally blind, lacking a crystalline eye lens, and both navigate and hunt by echolocation. Both are listed as Endangered on the IUCN Red List, and both face the same core threat: dams and water diversion that fragment their rivers.
Quick comparison
- Indus River dolphin — Platanista minor; bhulan; Indus River, Pakistan; Endangered.
- Ganges River dolphin — Platanista gangetica; susu/shushuk; Ganges-Brahmaputra-Meghna system; Endangered.
Of the two, the Indus dolphin lives within a country where our partner-funded teams operate. If you'd like to help, you can back river-habitat protection that supports the bhulan's last strongholds.
Read the full Indus River dolphin wildlife guide for the facts, IUCN status and conservation context — or donate to WARN to help fund the local partners protecting this species.
