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Strain (mean ± SD) during slow locomotion (5 cm/s) of Cupiennius salei. a, b Upside up (upright). c, d Upside down. Measurement sites: posterior distal tibia parallel the tibia axis (a, c), dorsal mid-tibia along the tibia axis (b, d). (a N = 4, n > 23; b N = 4, n > 17; c, d N = 3, n > 14). Data: Brüssel 1987. In inverted climbing, the footfall pattern and the strain varies strongly. Vertical lines indicate end of stance phase
