Ethologist Dr. Valerius Geist of the University of Calgary, Alberta wrote that Fenrir's maiming and ultimate killing of Odin, who had previously nurtured him, was likely based on true experiences of wolf-behaviour, seeing as wolves are genetically encoded to rise up the pack hierarchy and have on occasion been recorded to rebel against and kill their parents.
Ethologist Dr. Valerius Geist of the University of Calgary, Alberta wrote that the fable was likely based on genuine risk of wolf attacks at the time.
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