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*sound on* What is this wild male orca communicating? What we hear in this clip are not just random, meaningless sounds. This orca is expressing a complex communication system that is currently beyond the scope of human understanding. But what we do know is that this communication is a sharing of vital information within the pod. It is connection, relationship, in other words, it is culture. Individual orcas express their identity through cultural habits, including dialects—sets of calls learned

A woman sailing a yacht in the Mediterranean Sea filmed a frightening encounter with a huge orca, which attacked her vessel by repeatedly banging into it. | ABC News