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What is the yellow-spotted millipede?

• Scientific Name: Harpaphe haydeniana
• Appearance: This flat-backed millipede is notable for its shiny black or olive-green body, which is lined with bright yellow patches along its sides. These vibrant colors serve as a warning to potential predators.
• Other names: It is also known as the "almond-scented millipede" or the "cyanide millipede" because of its unique defense mechanism.
• Size: Mature individuals are relatively large, reaching up to 1.6 to 2 inches (4–5 centimeters) in length.

Habitat and diet

• Location: The yellow-spotted millipede is native to the moist, temperate forests along the Pacific coast of North America, with its range extending from southeastern Alaska down to Monterey County, California. They are particularly common in redwood forests.
• Where to find them: They spend their time on the forest floor, thriving in damp, dark environments. You can often find them under decomposing logs, rocks, and in thick leaf litter.
• Diet: As a detritivore, this millipede is a critical part of the forest ecosystem. It feeds on decaying organic material like dead leaves (especially conifer needles) and wood, helping to break down this matter and return valuable nutrients to the soil. One species can consume up to 50% of the dead leaves and conifer needles in a given area.

An astounding defense mechanism

• Cyanide production: When threatened, the yellow-spotted millipede doesn't bite or sting. Instead, it curls up into a tight ball and secretes a toxic hydrogen cyanide compound from pores on its sides.
• Almond scent: The chemical release produces a distinct almond-like smell, which is a potent deterrent to most small predators.
• Immune to its own poison: A remarkable adaptation of the species is its immunity to its own cyanide secretion, which it can metabolize into harmless substances.
• Relatively harmless to humans: While the amount of hydrogen cyanide is deadly to smaller animals, it is not dangerous to humans. However, it is best to avoid handling them, as direct contact with the toxin can cause skin irritation.

Role in the ecosystem

• Nature's recyclers: By consuming and processing decaying material, yellow-spotted millipedes perform an essential service for forest health. The waste they excrete is rich in nutrients, fertilizing the forest floor and supporting a complex food web.
• Nutrient release: The millipede's digestive process, aided by symbiotic fungi, drastically increases the availability of nutrients in the soil. This makes them a fundamental link in the soil food web.