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Orcas are called killer whales due to the fact that they are the top predator in the ocean. They are the hunters, not the hunted. They eat almost anything and everything they â¦ can find including other whales.hey are known to eat fish, squid, seals, sea lions, penguins, and even other whales, such as sperm whales. There are no reports of whale attacks on humans in the wild, although some have be known to happen in captive situations.
English-speaking scientists most often use the term killer whale, although the term orca is increasingly used. Killer whale advocates point out it has a long heritage. Indeed, the genus name Orcinus means of the kingdom of the dead, or belonging to Orcus .