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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.
Orcas are dolphins they are called killer whales because of their size and how they kill. They kill use mostly their weight and the strength of their jaws. An orca, or killer whale, is in the family Delphinidae, making it a dolphin by classification. However, all dolphins are in the order Cetacea, making all dolphins to be whales. Dolphins (and thus orcas) a family in the sub-order of toothed whales, which belongs to the order of whales.