Di: Isabella Visetti, Lara van Gammeren e Giuditta Wiesendanger
Erano estinti un secolo fa, ora ce ne sono cinque mila e il loro numero cresce di anno in anno. I castori non sono più considerati a rischio di estinzione dal 2022 e attualmente si discute su una loro regolamentazione.
La scorsa settimana è stato inaugurato un percorso in 14 tappe tra Svizzera e Italia che, nella parte elvetica, toccherà i villaggi e le tracce dei Walser in Vallese, Grigioni, Uri e Ticino.
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