Snurglar

Snurglars are large red Snurgles that appear during one segment of The Legend of Zelda: Spirit Tracks. They stole the three differently colored keys to the Fire Temple and flew off over the Fire Realm's mountain. They are shown on the Rail Map as animated sprites showing their current direction and next path, similar to obstacle trains, Dark Trains, and Armored Trains. The sprite also shows whether or not they are carrying a key, as well as the key's color. The Goron Elder advises Link to talk to the local Gorons for tips on defeating them.

While they normally fly at a moderate speed, they are cowardly and will speed up significantly if approached from behind. Additionally, they are adept at dodging shots from the cannon, and may turn around if shot at if the Spirit Train is not on the same path as them. To engage them, Link must head them off. When he gets within range, the music changes to a unique frantic-yet-comical theme as the Snurglar prepares to attack. Just like Snurgles, they attack by ramming after trumpeting. Also like Snurgles, they are bested via the whistle. However, they are only affected if Link does a short whistle followed by a long one, as it apparently reminds them of an animal they hate. They freeze up, allowing Link to hit them with the cannon, which stuns them and recovers the key. They wake up after a while, now aggressively pursuing at a higher speed to try and regain the keys. When one approaches Link, it can be stunned again through the same method. Additionally, they cannot go onto the tracks that lead straight into the temple, though they will loop past if Link sits there. Once he enters the temple, the Snurglars disappear for the rest of the game.