What can grow body back into days if cut in half?

The creature known for its remarkable regenerative abilities is the axolotl, a type of salamander. If an axolotl is cut in half, it can regenerate its lost body parts, including limbs and even parts of its heart and brain, over time. However, complete regeneration of the entire body in just days is not typical; regeneration can take weeks to months depending on the extent of the injury.