Smart Dolphin Answers Questions And Choose Favorite Snack Using Echolocation Computer

BBC Earth reports that a few specially trained dolphins can now choose their favorite foods and make choices with a special echolocation computer system.

The Echo Location Visualization and Interface System, or ELVIS, projects different shapes on a special screen underwater that the dolphins can fire their biological sonar at.

The computer calculates the strength of the signal, which clearly indicates to the trainers which fish the dolphin wants for a snack.