Millipedes are wormlike insects with numerous legs. Despite being called ‘thousand legs’, the closest any millipede comes to this number is 750 legs, with most species having only between 80 to 400 legs. The first pair of legs behind the head has a special modification for grasping food, piercing, and injecting venom. Every other body segment has two pairs of legs. Millipedes are anything between 2 and 300 mm long and mostly redbrownish in color. Many species can emit poisonous liquid secretions or hydrogen cyanide gas through tiny pores along the sides of their bodies as a means of defense. When disturbed or frightened, millipedes roll themselves into a tight ball. They are important agents of nutrient fluxes in many habitats, in some tropical areas being even more important than earthworms.