Butterflies such as the blues (Lycaenidae) have filamentous "tails" at the ends of their wings and nearby patterns of markings, which combine to create a "false head". This automimicry misdirects predators such as birds and jumping spiders (Salticidae). Spectacular examples occur in the hairstreak butterflies; they commonly perch upside down with the false head raised and shift their rear wings repeatedly, causing antenna-like movements of the "tails" on their wings. Studies of rear-wing damage support the hypothesis that this deflects attacks from the insect's head.