Miles ''Tails'' Prowler is a character in the Super Mario series. The first Mario game that he appeared in was Mario and Sonic at the Olympic Games. He is also called Tails. He is a flying, two-tailed fox. He is Sonic's best friend and sidekick, and one of the main characters in the Sonic the Hedgehog series. His name is a pun on the term 'Miles per Hour.'