Windscorpions are from 3/8 to 2 inches (1 to 5 cm) long. Most are yellowish to brown in color, and have four pairs of legs. The pedipalps are thin and used like feelers. The first pair of legs are more slender than the others and act as sense organs. The mouth parts (chelicerae) of windscorpions are formed into large jaws that work vertically and project forward from the mouth. The shape of the head with its enormous jaws is quite distinctive. The males often have a more slender body, which is often longer in the males than in the females and with their longer legs males look bigger.