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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.
A wild orca pod can cover over 160 kilometres a day, foraging and socialising. Why are they called âkiller whalesâ when they are dolphins? Dolphins and whales are closely related. Orcas were given the name âkiller whaleâ by ancient sailorsâ observations of groups of orcas hunting and preying on larger whale species.