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I agree that in contexts where it's not clear that Wikipedia is talking about a whale, we should save the reader a click (and not leave print readers in the dark) by mentioning what a rorqual is. In this article the paragraph already mentions whales and the reader can probably fill in the blanks, but I don't see any harm in clarifying that a rorqual is indeed a whale, rather than another larger sea creature that also lunge feeds. If   "