Animals that can regenerate lost body parts perfectly

Can crickets grow back their legs? Can a snake grow back its tail if it breaks off? This article will give you answers about animals that can regenerate body parts.

Did you know that some creatures have the ability to regenerate their body parts? Humans don't, but some creatures can regenerate limbs, tails, or even their brains!

Sometimes, animals even deliberately cut off part of their body when they feel threatened, and they can regenerate it later — this is called self-amputation.

It would be amazing if we could regenerate a lost limb or damaged organ. Imagine never having to wear dentures again because you could grow new teeth throughout your life! While these abilities may seem like something out of a futuristic science fiction movie, they do exist in the animal kingdom. While most animals don’t have these abilities, there are a few that can. However, these few creatures can give us insight into how to regenerate body parts.

Check out some of these amazing animals!

Table of Contents

• Lizard
• Starfish
• Flatworm
• Conch
• Deer
• Green prawn
• Zebrafish
• Axolotl
• Human Fingertip
• Spider

Lizard

Salamanders are amphibians with short tails and legs. There are over 700 species of salamanders. While all salamanders have some degree of regeneration, some species have a greater ability to regenerate than others. Some salamanders can regrow their tails within a few weeks, after removing the old one to distract a predator. The new appendage is fully functional as the original.

Lizards are the most typical example, generally, it is famous for its unique “trick” of escaping from enemies, which is to shed its own tail to distract and confuse the predator before quickly escaping with great speed. After the tail is shed, it can be completely regrown within 3 to 4 months. However, during this time, the lizard will be more vulnerable.

Starfish

Most starfish have five arms, which is the reason for their name. But some species can have up to 40 arms. Aside from their unique appearance, another interesting feature of starfish is their ability to regenerate their entire body from a severed limb, as most of their vital organs are located in these arms.

Flatworm

The remarkable regeneration ability of flatworms has fascinated scientists for hundreds of years. Most flatworm species can regrow all sorts of body parts, including their heads, through a process called stem cell respiration. These asexual creatures reproduce by tearing themselves in half, and it only takes about a week for the two pieces to become two completely different worms.

Conch

Trench conches are slow-moving gastropods that live on the seafloor. When you watch a trench conch moving, you may notice that its eyes protrude like two sticks. What’s remarkable is that the eyes of a trench conch can regrow after they’ve been lost. Compared to other gastropods, the eye regeneration process in a trench conchs is quite rapid – taking just a few weeks.

Deer

Antlers are the only organs in the deer body that can completely regenerate, and this happens every year. The antler regeneration process, initiated and maintained by stem cells derived from the deer's neural crest, is being used by scientists to study and model organ regeneration in other mammals.

Males grow their antlers every year to compete with other males for mates and to forage in the snow. Antler growth is extremely fast - about 0.6cm per day.

Green prawn

Shrimp can regrow their claws, like other arthropods. The process usually takes one molt to complete. However, the process can be faster if the shrimp are young, in a warm environment, and well-fed.

In particular, studies on the brain of crayfish have discovered even more interesting things. Scientists have found a link between the immune system and nerve cell regeneration in crayfish. This process is similar to the process of producing white blood cells, leading to the human immune system.

Zebrafish

Zebrafish can regenerate the stripes on their bodies and tails. If the fish's tail fin is bitten off, for example by another hungry fish, it can grow a new tail in about 2 to 4 weeks. Because zebrafish are experts at regeneration, researchers have used them as models in many complex tissue regeneration studies.

Axolotl

Axolotl, also known as “six-horned dinosaur” or “Mexican salamander”, has become a favorite among the aquatic community in recent years. In addition to its extremely strange appearance, this aquatic salamander is also famous for its ability to regenerate not only limbs but also spinal cords, hearts, eyes, and parts of the brain.

Unlike other vertebrates, the axolotl can continuously regenerate body parts throughout its life. By sequencing the axolotl's genome, scientists hope to discover how the species uses stem cells to regenerate tissue.

Currently, the axolotl species is critically endangered in the wild.

Human Fingertip

After millions of years of evolution, while many animals have achieved success in the ability to regenerate lost body parts, this function in humans is still at an extremely primitive stage.

There has been some success in regenerating fingertips, though, especially in children. Studies in mice have shown that those with a bit of nail left after amputation can successfully regrow the rest. In a study from the 1970s, scientists discovered a link between human fingernails and stem cells, which helps explain why amputated fingertips have a much better chance of growing back if at least part of the nail or cuticle is intact.

In simple terms, the tip of the finger will be able to grow back if the cut does not reach the nail, especially in children. But if the finger is cut off lower, it is almost impossible to grow back.

We already know that nails and hair can grow back even if they are cut short. The reason is that both parts of the body need a constant supply of cells to regenerate their hard structures. Therefore, scientists believe that nail stem cells may play a special role in triggering the regeneration process of organs, including nerves and bones.

Human fingertips contain a pool of stem cells that can turn into any other type of cell if given the right signal, but this usually only occurs in young children. The reason adults can’t regrow fingertips could be due to factors such as not having enough stem cells, not having the right environmental conditions, or not having the signals to start the regeneration process. More research is needed to reach a definitive conclusion.

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Spider

Spiders don't have skeletons like humans. Their skeletons are on the outside. It's called an exoskeleton.

The exoskeleton does not grow. So the spider builds a new, larger exoskeleton as it grows. It sheds the old exoskeleton in a process called molting. It must do this many times before it is fully grown.

During this molting process, they may regrow a lost leg! The new leg will usually be slightly smaller than the remaining seven legs.