Only Killer Whales (Orcas) prey on gray whales.
They are predators.
by hidding in the water
Yes
leopard seals preys on them and their prey is fish.
Killer Whales prey on Grey whales, which are quite big.
Killer whales are top predators in the sea. Healthy adults have no natural predators, but sharks prey on older, younger, or ill killer whales.
Penguins prey on fish. It is also prey of the sea lions and killer whales.
They are prey to hammerhead sharks and killer whales.
Killer Whales
Polar bears and killer whales prey on walruses.
Adults are prey for sharks and killer whales.