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The original was posted on /r/science by /u/SurayaThrowaway12 on 2025-07-19 00:32:57+00:00.

Original Title: The Foe You Know: Smaller Dolphins and Porpoises have been Observed Approaching Fish-Eating Northern Resident Killer Whales (Orcinus orca) in the Northeast Pacific, Possibly for Protection Against Other Predators, Amongst Other Reasons