When winter arrives in northern British Columbia, sometimes the snow is so deep the Wood Bison herds that inhabit the forest along the Alaska Highway tend to use the ploughed highway to move from one grazing area to another. The journey is difficult, and many bison succumb to the traffic. Records show that annually about 15 per cent of the population in the region dies as a result of these collisions. The aerial image is a befitting representation of how the threatened species manoeuvres these problematic terrains.