Scorpions are nocturnal. They often ambush their prey, lying in wait as they sense its approach. They consume all types of insects, spiders, centipedes, and other scorpions. Larger scorpions may feed on vertebrates, such as smaller lizards, snakes, and mice if they are able to subdue them. They capture their prey with their pedipalps, paralyzing them with their venom as well if necessary. The immobilized prey is then subjected to an acid spray that dissolves the tissues, allowing the scorpion to suck up the remains.
Most scorpion species are solitary in nature. The exception to this is bark scorpions, which may over-winter in aggregates of 20-30. The bark scorpion is also one of relatively few species that are able climbers.
The venom of the bark scorpion may produce severe pain (but rarely swelling) at the site of the sting, numbness, frothing at the mouth, difficulties in breathing (including respiratory paralysis), muscle twitching, and convulsions. Death is rare, especially in more recent times. Antivenin is available for severe cases. Certain people, however, may be allergic to the venom and can experience life-threatening side effects when stung (as occurs with bee stings).
Their bodies are covered with a waxy cuticle which also helps reduce water loss. For reasons yet unknown, the scorpion cuticle fluoresces under ultraviolet light i.e., a blacklight.