Reindeer racing, in which competitors on skis are pulled by reindeer galloping down the snow-covered trail, is a popular sport in Norway, Finland, and Russia. The indigenous Sami people are reindeer herders, and know which are the fastest for the sport. Reindeer that run the fastest are highly prized for breeding purposes, and sometimes reindeer are the actual prize for winning a race!
Variations on the sport include reindeer pulling sleds, and reindeer teams of two or more. In Anchorage, Alaska, people actually race against reindeer, which ends up looking like the running of the bulls in Pamplona. See pictures and videos of these various reindeer races at Atlas Obscura.
(Image credit: Flickr user jim h)