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Gli orsi polari sono stati avvistati per la prima volta mentre si nutrivano di delfini, giunti nell'Oceano Artico probabilmente a causa del surriscaldamento globale. E' raro che questi mammiferi raggiungano la zona nei mesi freddi dell'anno, ma lo scioglimento dei ghiacci ha fatto sì che la migrazione avvenga con qualche mese d'anticipo rispetto all'inizio dell'estate.
Come sostenuto, e documentato con foto datate aprile 2014, dallo scienziato norvegese Jon Aars, un anziano orso maschio ha catturato due cetacei, ne ha divorato uno e sotterrato l'altro, così da evitare che altri animali lo potessero mangiare prima di lui. Dopo questa prima osservazione, sono stati riportati altri cinque casi.
"Non penso - dichiara l'esperto - che questo cambiamento di abitudini sia segno di grandi stravolgimenti nell'alimentazione del carnivoro, ma semplicemente un adattamento alla situazione".
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