The Indus River dolphin is a dolphin that lives exclusively in the lower parts of the Indus River in Pakistan. They are one of only four river dolphin species and subspecies that spend their entire lives in freshwater. Only about 1,100 individuals are believed to exist today. Most Indus River dolphins are confined to a 750 mile stretch of the river and are separated into isolated populations by six barrages. They have adapted to life in the muddy river and are effectively blind. Like the Ganges River dolphin, Indus River dolphins rely on radar-like echolocation to navigate, communicate, and hunt prey.