It turns out that, like the antennas on an insect or crustacean, a ray uses its tail to sense its environment. The inside of a myliobatid stingray tail is remarkably complex, the scientists learned.

The giant freshwater stingray may be the world’s largest freshwater ... can reach 16.5 feet long, including the tail. There are reports of giant stingrays weighing up to 1,300 pounds, though ...