Guppy's severed tail with bones showing at the end of one side.
- When combined with two other Guppy items (Dead Cat, Guppy's Head or Guppy's Paw), Isaac will turn into Guppy. He will also gain The Mulligan effect and the ability to fly.
- If used in combination with the trinket The Left Hand every chest dropped will turn into a red one instead.
- Can be found without unlocking it.
- If the item is not in the Collection Page before the player initiates the 9 Deaths Challenge, it does not count as picking up the item, meaning it is not added to the Collection Page.