As shown in this series of clips of several adult female Phidippus princeps (Salticidae, from Greenville County, South Carolina, USA), jumping spiders make frequent "facing turns" directed toward moving objects, or toward any objects that they subsequently survey with their large, foveal front eyes (anterior medial, or primary eyes. Note how these spiders move their pedipalps up and down frequently ("flickering" or "flashing" movements). The purposes of pedipalpal movement is not known for certain, but may include both display and chemical sampling of the surface. This display may actually stimulate the movement of nearby insects, and thus their detection by these spiders. Frequent turns and pedipalpal movement are characteristic behaviors of jumping spiders. Several clips also depict jumps.
