GENERAL KNOWLEDGE

Detailed explanation-1: -Ganges River dolphin, Platanista gangetica gangetica, is one of the three obligatory freshwater dolphins in the world and is distributed in the Ganges–Brahmaputra–Meghna and Sangu–Karnaphuli River systems in India, Nepal, and Bangladesh.

Detailed explanation-2: -River dolphins such as the Amazon River dolphin (boto) and the South Asian river dolphins only live in fresh water rivers and lakes. Some dolphin species have populations that live in fresh water, these include the tucuxi (or sotalia), Irrawaddy dolphin and finless porpoise.

Detailed explanation-3: -When the sea dried up approximately 50 million years ago, the dolphins were forced to adapt to its only remaining habitat-rivers. Today, they can only be found in the lower parts of the Indus River in Pakistan and in River Beas, a tributary of the Indus River in Punjab, India.