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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.
Confidence votes 148. The killer whale, (Orcinus orca), is the largest member of the group of marine mammals known as dolphins (family Delphinidae). They are called killer whales because they attack and consume whales or other large prey such as seals and sea lions.