Only Killer Whales (Orcas) prey on gray whales.
NO.
Orcas will eat seals, and seals are mammals.
Killer Whales (Orcas), Large Sharks, and Humans are the Gray Whales only natural predators
They don't. Orcas - Killer whales are toothed whales, and don't deliberately eat anything as small as plankton.
Killer whales, or orcas, eat both.
There is no proof that transient orcas eat pilot whales.
Yes, killer whales or orcas are carnivors.
No. Killer whales eat gray whales.
Killer whales, also known as Orcas, eat manta rays.
They are the same thing.
Sperm whales are not known to eat orcas. They're too big to be swallowed whole and sperm whales don't really have teeth or jaws for taking such a big animal apart.