Caribou’s Ultra-Marathon
North American caribou take the prize for pure endurance, traveling up to 4,868 kilometers each year between their summer and winter territories. These hardy animals push through deep snow, cross frozen rivers, and battle fierce Arctic winds. Pregnant females lead the charge in spring, timing their arrival at the calving grounds to match the brief burst of nutritious plants that will feed their newborns. The entire herd moves like a living river across the tundra.