Orcas Can Be Eaten By White Sharks?

Nope. In fact, the reverse is true— orcas kill great whites. If we exclude humans who threat to all creatures for a while, there are unique animals who have no predators. There is a category for those animals. They are called apex predators.

A predator is at the top of a food chain, without natural predators. Apex predators affect prey species’ population dynamics and populations of other predators, both in aquatic and in terrestrial ecosystems. Included in this cathegory are, for example, lions, tigers, jaguars, polar bears, many birds of prey, crocodillians and my favorite, orcas.

 Apex predators affect prey species' population dynamics and populations of other predators, both in aquatic and in terrestrial ecosystems.

Killer Whale is the predator whom no other predators can defeat ever

Orca whales (aka killer whales) fear nothing and can eat everything in their environment, from fishes to whales. Also known as Killer whales, they are apex predators, as no animal preys on them. Not even the giant blue whale is safe.

They can even take down the feared great white shark. Killer whales have the second-heaviest brains among marine mammals (after sperm whales, which have the largest brain of any animal). They can be trained in captivity and are often described as intelligent, although defining and measuring “intelligence” is difficult in a species whose environment and behavioural strategies are very different from those of humans.

A killer whale plays with a ball of ice, soon after a researcher had thrown a snowball at the whale. Killer whales imitate others, and seem to deliberately teach skills to their kin. Off the Crozet Islands, mothers push their calves onto the beach, waiting to pull the youngster back if needed.

orcas kill great whites

Bull Sperm Whale vs Orcas

Some may question that a bull sperm whale can kill an orca, but so far nobody has been able to show evidences on this. On the contrary, we can find several evidences of orcas attacking other whales, including sperm whales. See Orcas and whales seen in fight to the death in the video

In the Pacific Ocean, orcas even evolved a preference on hunting sperm whales (see Sperm Whales Form Clans to Fight Off Orcas).

Instead of using teeth to protect themselves, sperm whales may use their highly potent sonar waves to scare off orcas, see Sperm Whales Have a ‘Sound’ Way of Escaping Hungry Orcas, but still it seems orcas do not fear them at all:

While observing sperm whales off the Sri Lankan coast, Philip Hoare came face to face with eight hunting orcas who had no fear of the 100-strong sperm whale pod (see An extraordinary battle between sperm whales and orcas – in pictures)

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Summary
Do Great White Sharks Eat Orcas?
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Do Great White Sharks Eat Orcas?
Description
Nope. In fact, the reverse is true—orcas kill great whites. If we exclude humans who threat to all creatures for a while, there are unique animals who have no predators. There is a category for those animals. They are called apex predators.
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