From the Super Mario Wiki
Centipedes are giant orange monsters that pace back and forth atop the mountains in the Level 3-4: Frustration in Yoshi's Story. They have sixteen segments (counting the head) with a pink spike on every segment except the head. They are invincible, and sometimes take a new path when there's a fork in the road. The player should be extremely careful because they can be hard to jump over.
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