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TIL rats can distinguish between Riesling and Sauvignon Blanc
(pmc.ncbi.nlm.nih.gov)
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this post was submitted on 03 May 2025
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They're not what you'd call similar varietals, and rats have powerful olfaction. It's not surprising in itself, unless you're in the habit of thinking of animals as being essentially lesser than humans.
They're at opposite sides of the sweetness spectrum, they should be distinguishable by sugar content alone.
Riesling can be anywhere in the sweetness scale, both can be equally dry.
Even Trocken is still sweeter than I'd associate with a Sauvignon Blanc, and if they're just calling it "Riesling" it's probably a Spatlese or something.
Any Riesling from Alsace will be XD.
[Obligatory note that humans are animals]