Creature
Immortal Jellyfish
Invertebrate
No bigger than a fingernail, the immortal jellyfish can turn its body back into a baby and begin life all over again — the only animal known to do so.
💡 Fun Facts
- The only known biologically immortal animal.
- When sick or old, it can transform its cells back into a baby polyp and start its life over.
- They are smaller than your pinky nail.