Most of the time, their food is decaying leaves and other dead plant matter. Millipedes are not poisonous, but many species have glands capable of producing irritating fluids that may cause allergic reactions in some individuals. This protects them from being constantly eaten because of their slow movement. Generally, they are not a pest, although young seedlings in greenhouses can be sometimes eaten by these creatures. "Xenobolus carnifex "is known for its common infestation of thatched roofs in India. Several species swarm houses and farms, causing damage.