Heatoises are enemies and Sub-Bosses in Spirit Tracks.
Usually accompanied by a Winder, when hit or provoked the Heatoise will put its limbs and head into its shell and spin towards Link. The object to defeating a Heatoise without the bow and arrows is to cause the Heatoise to spin into the Winder, which stuns the Heatoise during which time Link can strike it with his sword. With a bow, Link simply has to shoot its head with arrows.
Heatoise's name is a combination of heat and tortoise, in reference to the animal it is based on and its location in the Fire Temple.
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Link leading a Heatoise into a Winder