There are two subspecies of the South Asian river dolphin, a freshwater dolphin that is the National Aquatic Animal of India and lives in the Ganges and Indus rivers. It lacks a dorsal fin, and instead has more of a dorsal lump. This species has an elongated snout with lots of long, curved, sharp teeth that are visible even when its mouth is closed.
While most dolphins use echolocation, the South Asian river dolphin is entirely reliant on it. Lacking a crystalline lens in its eyes, it is unable to see clear images and at most can distinguish light from darkness. Both the Indus and Ganges river dolphins are classified as endangered by the IUCN Red List. While it is believed they can return to a healthy population size, the continued building of dams, tributaries and effects from agricultural irrigation are destroying their habitat.
[Source: Convention on Migratory Species]
Photo: Elisabeth Fahrni Mansur & Rubaiyat Mansur Mowgli/Arkive