In the late spring, where warming softens the snows, all animals sink more deeply - they follow these chest deep trails through the snow, makes it easier for them.

Then, at night, when the temperature plunges and freezing hardens the upper surface into a crust, the wolves run on the surface - not the ungulates, who then wollow in the deep snow, still tryng to run faste then those in front of them in the channels and when hard pressed by a wolf pack strung out and running alongside them, lung out of the narrow deep trail where the wolves are actually above them. When lunging out of these trail, they tire and bog down quickly to lodge into snow they cannot move in.

I do not know the situation there, but with our snows of winter, this very thing happens here, in the Spring. In the deep winter with temps hovering -60 at night, wolves take turns running the caribou - who freeze their lungs and die by the number.

Oh yeah - wolves are great, they're our friends, just big 'police dogs' but with better attitudes, honest.

Ask the ass--le Farley Mowit or his fans.