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Di: ats/joe.p.
La stagione migratoria 2021 è da record per quel che riguarda la presenza di ghiandaie in Svizzera. Alla stazione di inanellamento del Col de Bretolet (VD) sono stati registrati 154 esemplari, quando la media abituale è di 13 all'anno.
I dati, rende noto in un comunicato odierno la Stazione ornitologica svizzera, suggeriscono una vera invasione. L'ultima volta era accaduto nel 2019. Questo fenomeno è dovuto all'amore di questo uccello per le ghiande: la disponibilità di queste ultime influenza gli spostamenti del piccolo corvide.
In Svizzera la ghiandaia è un migrante parziale. La maggior parte degli uccelli rimane per l'inverno, ma alcuni migrano verso il sud della Francia.
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