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I don’t think there’s much that will predate orcas, at least adults, other than perhaps humans or hypothetically other orcas.

They are apex predators, they don’t have natural predators.

Humpback whales have been known to defend other animals from Orcas. The food of my enemy is my friend type of thing I guess.

The humpback whale and orca beef is kind of hilarious.

Orcas are kind of assholes and it seems other animals care.