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In diversi punti della città di Winterthur (marciapiedi, piste ciclabili, piazze) si trovano attualmente a terra curiose formazioni. Ricordano forme insolite: anice stellato, popcorn gigante, praline irregolari, frutti esotici o addirittura organismi alieni. In realtà sono le cosiddette Knoppern, deformazioni delle ghiande causate da un insetto: la vespa galligena delle Knoppern (Knoppern-Gallwespe).
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https://www.rsi.ch/s/703911
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