5 Animals That Can Regrow Lost Body Parts

Animals That Can Regrow Lost Body Parts

Have you ever wished you could regrow a lost body part like a lizard regrows its tail? As amazing as that would be, most animals can’t regenerate lost limbs or organs. However, there are a few incredible creatures that do have this ability.

In this blog article, we’ll explore 5 animals that can regrow lost body parts and how their regenerative abilities work. Understanding these natural mechanisms could one day help scientists find ways to heal injuries and fight disease in humans.

What is Regeneration?

Regeneration refers to the ability of an organism to regrow or replace cells, tissues, and organs that have been damaged or lost. This involves complex cellular processes that activate stem cells and reorder existing tissues to restore the original anatomy and functions.

Regeneration allows animals to survive predator attacks, accidents, diseases, and other events that damage their bodies. It gives them resilience and supports their survival.

Not all animals share the same regenerative capacities. But for those that do, it provides a selective advantage to endure threats in their environment.

5 Animals That Can Regrow Lost Parts

Here are 5 incredible creatures that possess regenerative superpowers:

1. Axolotls


Axolotls are unique amphibians that can regrow lost limbs, tails, spinal cord, skin, internal organs, and parts of their brain. They can accomplish this thanks to stem cells distributed throughout their bodies.

When an axolotl suffers an injury, specialized cells accumulate at the wound site and transform into a blastema – a mass of dividing cells. The blastema can become almost any cell type, allowing it to recreate missing structures. Within months, brand new and fully functional body parts are restored.

Axolotls never mature into terrestrial adults, which is key to retaining their regenerative abilities. Scientists hope to uncover why axolotls have such extensive healing powers to apply regenerative medicine approaches in humans.

2. Sea Stars

Sea stars, commonly referred to as starfish, are marine invertebrates that have outstanding regenerative capacities. They can reconstitute lost arms and even rebuild their central discs.

Sea stars don’t have brains or blood, but they have a complex nervous system and circulatory system animated by seawater to coordinate regeneration. They utilize specialized cells to heal wounds, then remodel tissues and regrow missing body parts.

In some species, a fully formed baby sea star can even grow from a single severed limb. This makes sea stars masters of regeneration in the animal kingdom.

3. Salamanders


Salamanders are amphibians that can regenerate full limbs, including bones, muscle, tissues, nerves, and skin. The regenerative process relies on cells called satellite cells that can change function to generate replacement parts.

When a salamander loses a limb, epithelial cells migrate to cover the wound surface. Beneath this protective barrier, satellite cells self-renew and specialize to give rise to a blastema structure from which the new appendage develops.

Different salamander species regenerate tissues at varying paces. But within a month or two, many can rebuild fully functional and proportional limbs.

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4. Planaria


Planaria are tiny flatworms with immense regenerative capabilities. They can reproduce both sexually and asexually. If cut into pieces, their fragments will regenerate into complete organisms.

Planaria don’t have complex organs. However, they possess tissues derived from all three embryonic germ layers – endoderm, mesoderm, and ectoderm. This allows them to regrow any body part including their head and internal organs. They utilize pluripotent adult stem cells called neoblasts to drive regeneration.

Researchers study planaria to better understand the molecular pathways that control regeneration. These insights could help advance regenerative medicine for humans in the future.

5. Deer Antlers

Deer Antlers

Deer antlers are unique mammalian appendages that regenerate every year. As the only mammalian organs that can completely regrow, they offer hope for new regeneration therapies.

Deer antlers grow from permanent bony protuberances called pedicles located on the animal’s skull. Each spring, they rapidly develop full-size structures covered in a furry skin called velvet – the fastest-growing tissue of any mammal. In the fall, deer shed their antlers, then regrow another set the following spring.

This repeated cycle of antler regeneration depends on stem cells present in the pedicles. As days get longer regulating hormones, the stem cells differentiate to form cartilage and bone needed to rebuild the antlers. Understanding exactly how they accomplish this could someday enable limb regeneration in humans through similar pathways.

Here are five more Animals that regenerate their body parts.

  1. Zebrafish

Zebrafish are small freshwater fish that have robust regenerative abilities. They can regenerate injured hearts, retinas, spinal cords, brain tissue, and fins. Their healing relies on progenitor stem cells that transform into replacement structures.

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2. Hydras

Hydras are tiny aquatic invertebrates that can regenerate whole organisms even when cut into tiny fragments. They utilize interstitial stem cells throughout their bodies to regenerate tissue, organs, and entire hydras.

3. Sponges

Sea sponges are simple aquatic animals with no true tissues or organs. But they have remarkable regenerative capacities – a fragmented sponge can reassemble itself and restore normal functions. They use aggregating cell movement to drive regeneration.


Many lizards have strong regenerative abilities, especially of their tails. Using progenitor cells, lizards can rebuild cartilage, tissues, blood vessels, and nerves to restore their tails, allowing them to escape predators after autotomy.

5. African Spiny Mice

An African spiny mouse species called Acomys can completely regrow large swaths of skin, hair follicles, and cartilage after extensive wounds – without scarring. Their regenerative mechanisms involve complex interactions between immune cells, epithelial cells, and stem cell dynamics.


The ability of some animals to regenerate lost body parts is truly remarkable. Creatures like axolotls, sea stars, salamanders, planaria, deer, zebrafish, hydras, sponges, lizards, and African spiny mice possess cells and processes that allow them to regrow damaged or missing limbs and organs. They can recreate bones, tissues, blood vessels, and even neural structures.

While specific regenerative mechanisms vary between species, they demonstrate biological systems’ incredible resilience and healing potential.

As scientists uncover the regenerative superpowers organisms have already developed through evolution, biomimicry and biomedical engineering may someday allow us to achieve similar feats of healing. Regenerative medicine could help patients regrow, repair, or replace lost and damaged body parts. Today’s science fiction might become tomorrow’s reality by studying and emulating nature’s extraordinary regenerators.