Those dolphins can fly across trainers lying horizontally on water in certain spaces and move them by wagging tail fins.

In the past only two of the dolphins did arithmetical problems and showed movements of taking the stage out of water, but now all of them can perform such stunts.

Seals, too, can perform new eight stunts, including ring and ball games and playing volleyball.

Pak Tong Ju, chief engineer of the dolphinarium, told KCNA that they taught more than 50 stunts to dolphins and seals up to now.