Only fragments of palpigrade behaviour have been observed. Palpigradi (micro whipscorpions) walk on the legs of the second to fourth pairs. The pedipalps commonly do not swing in phase with the walking legs, but can be included for an eight-legged gait on rough terrain. The prolonged first legs arch slightly sideways, touch the ground infrequently and are not engaged in locomotion. Cave palpigrades walk readily on moist rock, but have trouble escaping from the water surface in pools and puddles. Upon irritation, micro whipscorpions raise the flagellum in the sagittal plane and lift also the three last segments of the opisthosoma to some extent. For grooming they draw limbs and flagellum through the shears of the chelicerae.