The Porcupine caribou or Grant's caribou (Rangifer tarandus granti) is a subspecies of the reindeer or caribou found in Alaska, United States, and Yukon and the Northwest Territories, Canada. It resembles the subspecies known as the barren-ground caribou (R. t. groenlandicus) and is sometimes included in it. By July 2017, the Porcupine herd had reached a record high of about 202,000 to 235,000 animals. Sixteen years earlier, in 2001 the same herd was only half as large. While other barren-ground caribou herds have declined by 90%, the Porcupine herd has remained relatively stable.