Lumba-lumba mampunyoi sabuah sistem nan digunoan untuak bakomunikasi saarato jo manarimo rangsang nan dinamoan jo sistem sonar, sistem iko dapek manghindari benda-benda nan ado di mungko lumba-lumba, sahinggo tahinda dari banturan.
The dolphins have a system that is used to communicate and receive stimuli called sonar system, the system can avoid objects in front of the dolphin, so avoid the collision.