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I've read that "all dolphins are whales". I've also read that "the killer whale (orca) is a type of dolphin" and that "orcas are not whales, they're dolphins."

But if the orca is a dolphin and all dolphins are whales, aren't orcas whales?

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All dolphins are whales but all whales are not dolphins. Orca, the killer whale is the largest member of oceanic dolphin family.

https://en.m.wikipedia.org/wiki/Killer_whale

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