They may not be building a wall like the President of the United States, but Grey wolves in Prince Albert National Park are making sure their territories and boundaries are marked so other packs don’t take over their food sources. That’s one of the observations from a study of two different packs of wolves in the Park, which was looking at their interactions with bison.

Parks Canada resources manager Joanne Watson says there were questions as to whether the packs would re-learn how to hunt bison again, because for so long there were none to hunt. Of the two packs, one did and the other didn’t. Watson believes it could be because the bison travel back and forth between the two territories and there are always bison in the one area, but only in winter in the other, so there is less opportunity for that pack. Although a few bison have been felled, Watson says the Grey wolves’ main diet is deer, moose and elk.

Watson adds that there is a definite border between the two packs, market with scratches in the dirt, urine and scat. She says there are lots of turf wars. They have discovered the bodies of wolves along the territory line showing signs of a fight.