Learning Smart

in video above, some creatures eat the fish carcasses wildly in a few second. The remain is just a fish bone. It makes many natives scary. After reaserch, the reasercher have proved that creatures are not dangerous for human. evidently, that creatures is cirolana (latin name). In the reaserch, about 500 cirolanas are placed in an aquarium. then, someone sink his finger to that place. but, the result is cirolanas become scared, even they feigned death.
Cirolanas have a big role in food chain. They are eated by bigger fish in the sea. after the reaserch put a fish in the same aquarium, they are eaten by that fish.