Ganges River Dolphin (Platanista gangetica) is a species of River Dolphin found in freshwater rivers of Nepal, India, andBangladesh. In India, it is distributed in seven states namely, Assam, Uttar Pradesh, Madhya Pradesh, Rajasthan, Bihar, Jharkhand and West Bengal. The Ganges River Dolphin has a greyish brown stocky body with a long thin snout, rounded belly and large flippers. As its eye lacks a lens, this species is also referred to as the ‘blind dolphin’. Being a mammal, the Ganges River dolphin cannot breathe in the water and so has to surface every 30-120 seconds. This animal is referred as ‘Sihu’ in Assamese because of the sound it produces when breathing. It usually lives in small groups. Ganges River Dolphin feeds on fish and invertebrates, such as prawns, catfish, freshwater sharks, gobies and carp. The species was once a common sight in the Brahmaputra River system including its major tributaries. But the population has declined in the past decade due to habitat loss and degradation, fisheries bycatch and pollution. A survey conducted in 2005 by ‘Aranyak’ recorded altogether 250 dolphins in the entire Brahmaputra Valley with 27 in Kulsi river (Kamrup), 26 in Subansiri (Lakhimpur) and 197 in Brahmaputra mainstream. It has been listed as endangered species in the IUCN Red List of Threatened Species. The Assam Government adopted Sihu as State Aquatic Animal on 5th April, 2008.