Ordinary (Rangifer tarandus) and flying ones play a role in Santa Claus story. The legend of flying reindeers (eight of them) was probably originated by Clement Clarke Moore in early 19th century poem "Twas the Night Before Christmas".

The reindeer are sturdy, short-legged animals, having a brownish coat that is dark in the summer and light in winter; the long hairs under the neck, the fur just above the hoofs, and the region about the tail are almost white. The stag measures about 1.8 m (about 6 ft) in length and is about 91 cm (about 36 in) tall, measured at the shoulder; the doe is somewhat smaller. The animals have large, spreading hoofs that enable them to travel on snow-covered areas. They feed on vegetation such as grasses, leaves, mosses, and lichens, obtained by scraping away the snow cover with their antlers and hoofs.

For many centuries reindeer have been domesticated in their original habitat, which ranges from Norway into northern Asia. They have been trained to wear harnesses because of their strength, speed, and endurance in pulling sleds over snow.