American Giant Millipede: Misunderstood, Not Scary

Published on June 18, 2025 by Stella
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Introduction to the American Giant Millipede

The American giant millipede is one arthropod that is not only the most interesting but also one of the most misunderstood arthropods in North America. The scientists call it Narceus americanus, and it is usually referred to as the “worm millipede” or “iron worm.”

The American giant millipede with its odd look and docile nature is so captivating that it has aroused the curiosity of all nature enthusiasts.

How Do American Giant Millipede Look?

How-Do-American-Giant-Millipede-Look

The American giant millipede is not only large in numbers but also in size. It is one of the largest millipede species in North America. It commonly attains lengths of about 4 to 8 inches with some individuals getting even longer. The bodies of millipedes are often cylindrical. They are divided into segments, which are regularly dark brown pr brown-red in color, and are covered with a beautiful and shiny coat.

Most of their bodies have two pairs of legs in each section, and the grown-up ones can be found with up to 300 or more legs, although almost near what their name shows that is “thousand.” Millipedes also have an antennae.

American giant millipedes play a small but important role in the environment, and they benefit themselves too. They’re a night owl. They will usually be found in the shade during the day and more active at night. They are totally harmless and peaceful and some even keep them as pets.They don’t move around much. You must know that with good care, they can live up to 10 years.

Places Where You Can Find American Giant Millipedes

Places-Where-You-Can-Find-American-Giant-Millipedes

Throughout the eastern United States, you will find the American giant millipede, from the humid forests of the Southeast to as far west as Texas and north into the Midwest. They are particularly adaptable where they dwell. They can be present in parts of the territory, predominantly:

  • Deciduous forests and mature woodlands.
  • Next to rotting logs, stones, and a thick layer of leaves.
  • Areas with high humidity, such as drainage ditches and mossy patches.

The millipedes are active during the spring and fall seasons and appear after rainfall in damp weather condition. The millipedes hide in deep soil layers and decaying wood during winter to protect themselves from cold temperatures.

Wild observations reveal that the biggest American giant millipedes are seen in old-growth forests which contain plenty of dead wood and has high humidity levels.

Are American Giant Millipedes Dangerous?

That size and look of the American giant millipede might want to scare you off. But it is not at all dangerous. The Giant American millipede does not cause any harm to humans and pets. These millipedes are not stingers, and they don’t contain any venom. When threatened, the millipede’s primary defense mechanism involves it’s being curled up very tightly and, if the need arises, they secrete a mild liquid from their body.

Those liquids contain benzoquinones, which may turn your skin’s color temporarily or cause slight irritation when touched. The liquids are generally not poisonous unless you have any allergy or a sensitive skin. It is advisable to clean your hands and don’t try to touch your eyes or mouth at all.

Conclusion

One of the jobs the millipede does is to help break down the plant matter which keeps the natural ecosystem healthy. The American Giant Millipede, if you find them in the environment or if you keep them at home, they are a great example of how recycling works in nature. Hence, they deserve to be protected!