Migliaia di gru cenerine (Grus grus) in migrazione hanno traversato la Svizzera nei giorni scorsi.
Si tratta di un record, secondo la Stazione ornitologica di Sempach (LU), i cui collaboratori, sparsi in 150 località hanno osservato in diversi casi stormi di oltre 100 individui.
L'aumento dei transiti nei cieli elvetici, riscontrato negli ultimi anni, cosi come quello della popolazione, porta gli esperti a ipotizzare che sia stata aperta una nuova via migratoria che conduce questi volatili dall'Ungheria e dalla Cechia, attraverso la Confederazione, nel sud-ovest dell'Europa.
ATS/SC
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