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Fig. 2. (A) Video image of an O. smaragdina ant on the Plexiglas turntable rotating at 2470 revs min-1. Dotted arrow shows the sliding trajectory. Note the two hindlegs in contact. (B) Gradual slide of O. smaragdina ant on a smooth turntable at 20°C. (C) Relationship between friction force and velocity for the data shown in B; model II regression. (D) Plot of regression residuals.