Reznor

Reznor are dinosaur-like bosses that reappear multiple times in Super Mario World. According to the game manual, it said that they were cursed by Bowser. They are first found in a castle on top of the Vanilla Dome, that Mario can access via a secret route. When Mario challenges them, they are rotating around a large waterwheel like structure. Mario only has a few seconds to knock them off their platforms before the floor crumbles underneath him.