A reindeer is a large, hoofed mammal with antlers. Contrary to popular Christmas folklore, reindeer can't really fly. Shhhhh.
The mythological reindeer that pull Santa Claus's sleigh first appeared in print during the nineteenth century in the United States. Real reindeer are found in Northern Europe, North America, and Siberia — although North American reindeer are more often called caribou. In Arctic and Subarctic areas, reindeer are regularly hunted and raised for their meat, milk, and hides. Reindeer comes from a Scandinavian root, similar to the Old Norse hreindyri.