The Ganges River Dolphin

The Ganges river dolphin (scientific name platanista gangetica gangetica) is a subspecies of dolphin that inhabits the freshwater rivers of the Eastern Himalayas. It can grow between 7 and 8.9 feet long, and it can weigh between 330 and 374 pounds. It is basically blind, as the only images it "sees" are those formed when the ultrasonic sounds it emits bounce off of the species it hunts. It usually travels either by itself or with a small group. It is chocolate brown in color as a calf and gray-brown in color as an adult. Females are larger in size than males and give birth to one calf, which they generally travel with, once every two to three years.

The Ganges river dolphin is classified as an Endangered species. It is this close to becoming extinct for two reasons. The first reason is that its population is reduced as the result of it becoming entangled in fishing nets and being hunted for its oil and meat. Because of this, one of the World Wildlife Fund's (WWF's) efforts to save it consists of encouraging the communities around a vital portion of its habitat to ban commercial fishing. The second reason is that both its population and the population of the species it hunts are reduced as the result of their habitat being polluted. Because of this, another one of the WWF's efforts to save it consists of encouraging the communities around a vital portion of its habitat to use natural fertilizers and not dispose of their sewage in its habitat. All of this is being done because it is a reliable indicator of its habitat's health.

Source for picture and all information: https://www.worldwildlife.org/species/ganges-river-dolphin