While the killer whale is rarely prey, it preys on many other animals, including fish, sea lions, squid, dolphins, penguins, porpoises and seals. The killer whale has also been known to prey upon large whales, including the blue whale. read more
Packs of orcas (which are really the largest of the dolphins, not whales at all) will chase whales until they are exhausted, and then attack. Great white sharks will attack small whale species, as well as young whales and sick whales. read more