Another explanation for a difference in wolf behaviour between North America and Europe / Asia that I once read about (can't remember where) is the frequent occurrence of mass human mortality events over there, such as disease outbreaks and wars. The resulting abundance of dead and dying humans caused wolves to become accustomed to eating us over the past 2-3 thousand years. It's conceivable that these circumstances might have had effects leading to differing behaviour in Old World Wolves vs. ours here.
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