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In the Eastern Pacific, the false killer whale has been known to target smaller dolphins during tuna purse-seine fishing operations; there are cases of attacks on sperm whales ("Physeter macrocephalus"), and one instance against a calf of a humpback whale ("Megaptera novaeangliae"). Killer whales are known to prey on the false killer whale, and it also possibly faces a threat from large sharks, though there are no documented instances.