These ancient cousins of true spiders also have eight legs. But they have a few things spiders don’t, including a long, thread-like tail made of fine hairs that can be “whipped” around to help the scorpion sense its environment. Unlike true scorpions, whip scorpions do not have a sting. Instead, when threatened, whip scorpions squirt attackers with an acrid, stinging acid that’s far stronger than vinegar from the base of its tail. In this picture, the white spots on the indicator paper are the acid released by the scorpion.