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Gli scienziati svizzeri hanno fatto chiarezza sulla specie di vespa Polistes helveticus, che vive in una zona umida a pochi chilometri da Zurigo. La “vespa svizzera” è conosciuta da diverso tempo, ma veniva confusa con una “gemella” che abita nel sud dell'Europa. Solo dopo il suo arrivo in Svizzera - a causa del riscaldamento climatico - i ricercatori hanno constatato l'errore e scoperto la lieve differenza fra i due insetti. La notizia è stata diramata dall’Università di Neuchâtel e dal Museo di storia naturale di Berna.
M.A./ATS
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