This tiny beetle is the only predator immune to a millipede's deadly cyanide gas
In short: In the forests of Northern California, a chemical battle unfolds between millipedes and a specialized beetle. While most predators are killed by the millipede's toxic cyanide spray, one beetle species has evolved to hunt them despite being significantly smaller.
The millipede species Xystocheir dissecta defends itself by secreting hydrogen cyanide gas and benzaldehyde, a combination that is lethal to almost all other organisms. These chemicals serve as a potent deterrent, with the scent of bitter almonds acting as a warning signal. While millipedes are immune to their own poison, they are usually safe from predation due to this chemical warfare.
However, research by entomologist Brandt Weary at the University of California Berkeley identified the beetle Promecognathus crassus as the only known predator capable of surviving a direct blast of this cyanide gas. Despite being only one-fifth the size of its prey, the beetle actively seeks out the millipedes to feed on them, successfully bypassing a defense mechanism that keeps all other animals at bay.
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- Summary by Intellect · source: This Millipede and Beetle Have a Toxic Relationship | Deep Look
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