74 / 76
Migrating caribou (Rangifer tarandus granti) of the Porcupine Herd in the Arctic National
Wildlife Refuge are at continuous risk from pressures to open the refuge for petroleum exploration,
which could interfere with their migration. The caribou migrate from their winter ranges in
both Canada and further south in Alaska to the coastal plain in the refuge in Alaska and back,
several thousand km every year, the longest of any migrating terrestrial mammal on the planet.