the immortal jellyfish

Basic Facts

• Scientific name: Turritopsis dohrnii

• Size: Very small — about 4–5 mm wide (smaller than a fingernail).

• Habitat: Warm, temperate oceans around the world.

• Nickname: “Immortal jellyfish” because of its ability to reverse aging.

Unique Ability

• Can revert from its adult medusa form back to its polyp (baby stage) through a process called transdifferentiation.

• This allows it to essentially “reset” its life cycle and avoid natural death from aging.

Limitations

• Not truly invincible — it can still die from:
  

  • Predators

  • Disease

  • Environmental hazards

• Its “immortality” is just a survival trick, not eternal life.

Scientific Importance

• Scientists study it to learn:
  

  • How cells can change into different types (cellular regeneration).

  • Possible applications for anti-aging research and regenerative medicine.

Fun Facts

• Discovered in the 1880s but its “immortal” abilities weren’t confirmed until the 1990s.

• It’s considered one of the few known animals capable of biological immortality.