The Vinegaroon, sometimes called a whip scorpion or uropygid, is part of the arachnid family and is related to spiders and scorpions. They lack venom, but can spray acetic and caprylic acids when bothered (the mix smells like vinegar, hence the name). They are nocturnal hunters preying and keeping populations of scorpions, cockroaches, crickets, millipedes, and slugs in check.