The American Giant Millipede is one of North America's largest arthropods, reaching 4 inches, with a cylindrical dark gray body banded with pink-orange segment margins. Unlike centipedes, it is harmless and slow-moving, feeding on decomposing plant matter. When threatened it coils into a tight spiral and secretes benzoquinones — chemicals that can temporarily stain skin yellow.
Best time to see a American Giant Millipede
The best time to see a American Giant Millipede is April–August, when about 62% of U.S. sightings happen, based on 6,103 research-grade iNaturalist observations.
Not certain it is a American Giant Millipede? What bug is this? walks through what to check first and the lookalikes that catch people out.
Recent American Giant Millipede sightings near you
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