Vinegaroon, Mastigoproctus giganteus
Vinegaroons are closely related to spiders and scorpions. Their common name comes from the fact they can spray acetic acid from the base of their long tail, or flagellum, when threatened. The acid is relatively harmless to human skin but can burn if comes in contact with the eyes. Vinegaroons are nocturnal and feed on small insects and arthropods. Their intimidating pincers are actually modified mouthparts, or pedipalps. Despite their ferocious appearance, their pincers are not strong enough to pierce skin.