It raises its head and changes its position basically every day, ” explains Professor Raimo Hissa, who has studied the winter sleep of bears for many years at the University of Oulu, in Finland.
Ta tõstab pead ja vahetab asendit peaaegu iga päev, ” selgitab Soome Oulu ülikooli professor Raimo Hissa, kes on aastaid karude taliuinakut uurinud.