Reindeer and caribou are not the same species. Reindeer are a type of deer that are domesticated and commonly kept as livestock. They are native to the Arctic and subarctic regions of the Northern Hemisphere and are often used for transportation, hunting, and as a source of meat and fur. Caribou, on the other hand, are a type of deer that are found in the wild and are not domesticated. They are native to the Arctic regions of North America, Europe, and Asia.