In some cultures, reindeer and caribou are considered the same animal. However, there are some subtle differences between the two. Reindeer are domesticated animals that have been selectively bred for use as draft animals and pack animals, while caribou are wild animals that roam freely in the Arctic tundra. Reindeer have been domesticated for thousands of years and are typically larger and more muscular than caribou. Caribou are more likely to be found in larger herds, while reindeer tend to be more solitary or found in smaller herds.