The killer whale is actually a dolphin. It is the largest of the dolphin family. Because of their fierce reputation, they are sometimes called the Ballena asesina ("assassin whale") by the Spanish. They were referred to as "whale killers" by sailors who witnessed their attacks on larger cetaceans, and over time this name was changed to "killer whales." They are called this not because they harm humans but because they do sometimes kill other whales, hunting them in packs thereby earning the title "Wolves of the Sea." Hope this helps :)
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