No, a reindeer is not an elk. A reindeer, also known as a caribou, is a species of deer native to the Arctic and Subarctic regions. Reindeer are known for their distinctive antlers, which can grow up to 5 feet long in males. They are also known for their ability to withstand extreme cold temperatures and for being domesticated by humans for use as draft animals. Elk, on the other hand, are a different species of deer that are larger and have different physical characteristics than reindeer.