These two wolves are having a disagreement over the remains or a bison they killed ten days previous. While this encounter ended without either wolf being hurt, wolves from different packs often kill each other over territorial disputes.
A wolf is more likely to die from an encounter with another wolf than for any other reason during the course of its life. This constant strife acts as a self regulator of wolf populations.
Re-introduced wolves have filled all of the available habitat in Idaho and Yellowstone. They will control their own numbers as they defend a space large enough to sustain their own pack from intrusion by other wolves.
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