INDIAN GEOGRAPHY

Detailed explanation-1: -The presence of Susu (also called blind dolphin) in the Ganga-Brahmaputra river is an indication of the health of the river. The Ganges river dolphins can only live in freshwater and are essentially blind.

Detailed explanation-2: -The Ganges river dolphin was officially discovered in 1801. Ganges river dolphins once lived in the Ganges-Brahmaputra-Meghna and Karnaphuli-Sangu river systems of Nepal, India, and Bangladesh.

Detailed explanation-3: -The correct answer is Susu. A species of dolphin is found in the freshwater of the Ganges and Brahmaputra rivers, locally called Susu.

Detailed explanation-4: -Susu Dolphin is found in the waters of the Ganga river. The Ganges river dolphin is found mainly in the Ganges and Brahmaputra rivers and their tributaries in Bangladesh, India, and Nepal.

Detailed explanation-5: -The Ganges River Dolphin Platanista gangetica gangetica is a mammal primarily found in the Ganges and Brahmaputra Rivers and their tributaries in India, Bangladesh and Nepal.