Biggest vinegaroon

Also known as tailed whip-scorpions or uropygids, vinegaroons are scorpion-like arachnids that can spray a mixture of chemicals from their anal glands to ward off predators. The main component of this mixture is acetic acid (vinegar), hence their common name. The world's biggest vinegaroon is the giant vinegaroon Mastigoproctus giganteus, native to the southern USA and much of Mexico. It can grow to 6 cm long, and the heaviest on record was an adult female that weighed 12.4 g.