Looking for some info on elk migration. Many books or articles talk about how elk will migrate from higher elevations to lower elevations. So my first question is do they migrate based on temperature drop, or snow cover over food sources? Or do they migrate instinctively at certain times of year regardless of weather? I have also looked for elk migration routes or maps and cannot seem to strike any luck in that area. I found a site that makes them for WY,CO, and MT, but not NM. Any info would be much appreciated.