When disturbed, millipedes often roll into tight coils. Many can secrete noxious fluids from specialized glands along their body to repel predators. Millipedes cause little or no damage to our plants. Although venomous, the toxin is rarely dangerous to humans. Centipedes are beneficial hunters.
Most crustaceans live in fresh or salt water.
The Sow Bug is considerably larger than the Pill Bug and has two prominent tail-like appendages. It is incapable of rolling itself into a ball. Most of us were introduced to these critters as children. To this day, children around the world are charmed and delighted by the Pill Bug's ability to roll into a tight ball when disturbed. Every gardener is well acquainted with these harmless little fellows.