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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.
1 Orcas are also called Killer Whales because they are very active hunters. 2  They eat large animals such as fish and marine mammals like seals or even other kinds of whales! 3  Sperm whales are among the few animals large enough to catch and eat giant squid. Orcas are also called Killer Whales because they are very active hunters. 2  They eat large animals such as fish and marine mammals like seals or even other kinds of whales! 3  Sperm whales are among the few animals large enough to catch and eat giant squid.