ganga

In the early 90s, the Indian government released specially-raised flesh-eating turtles into the Ganga to eat and clear the river of partly-burned corpses from the Varanasi ghats. The programme failed as poachers captured and wiped out the turtle population (again).

The Ganges River Dolphin is essentially blind as its eyes lack lenses. It uses echolocation to locate its prey and uniquely swims sideways.