Based on traditional knowledge, it appears that when muskox are in an area—our muskox populations are very healthy right now—they tend to expand, move into new territories, spread out, and then colonize new areas. We are seeing muskox moving south into the treeline now, not necessarily into the same areas that barren ground caribou move through towards the winter, so it's not so much a displacement of barren ground caribou habitat.
On May 7th, 2015. See this statement in context.