They are predators.
Penguins prey on fish. It is also prey of the sea lions and killer whales.
All mammals have some sort of predator prey relationship. The only natural enemy to whales is the orca (the killer whale in question), other than that, whales have no NATURAL enemies.
Killer whales prey on sea lions, as do some types of sharks.
In California great white sharks are the otters predator but in Alaska killer whales seem to be eating them.
the blue whale doesn't have no predators unless a group of killer whales attack it
Killer Whales
killer whales
A killer whales predator is a human cause they hunt them for blubber
The killer whales' predator is man. Man hunt the killer whales and take their skins to sell them.
Predator
Only Killer Whales (Orcas) prey on gray whales.
The killer whale (Orca) is the top predator of the ocean.