very few animal get regeneration process like starfish,axolotls,flatworm,jellyfish,hydra ext.
8. Jellyfish :- Jellyfish have remarkable regenerative abilities, particularly in their bell (body) parts. When injured or damaged, certain species of jellyfish can regenerate lost or damaged tissue. One fascinating example often cited is the Turritopsis dohrnii, commonly known as the “immortal jellyfish.” This jellyfish has the remarkable ability to revert back to its juvenile form after reaching adulthood
11. Sea Slug :- Some sea slugs, can regenerate their heads, allowing their entire bodies to regenerate.