How pronghorn antelope complete one of North America's longest land migrations and what threatens this remarkable journey.
The pronghorn migration is an ancient pattern shaped over millennia, and the welfare of migrating animals depends on its continuity. Animals that cannot complete their migration face starvation, energy depletion, and physiological stress. When pronghorn are blocked by fences, roads, or development, they pile up at barriers, exhaust themselves in attempts to find passage, and may ultimately starve if the route is completely blocked. The progressive fragmentation of migration corridors is a welfare crisis in slow motion, playing out over decades as development encroaches further. Wildlife crossing infrastructure and fence modification programmes directly address this welfare problem with measurable results.