Fig. 6. Relationship between (relative) stride length and stride frequency in normal ants and after manipulation of leg length. Stride length was normalised with regard to body size (alitrunk length, see Materials and methods), and is shown on the ordinate; the abscissa gives stride frequency. Each data point represents one individual. Best fit regression lines are indicated; the respective equations are, from top to bottom: stilts, stride length=0.124xstride frequency+2.14; normal, stride length=0.084xstride frequency+1.89; stumps I, stride length=0.061xstride frequency+1.788; stumps II, stride length=0.057xstride frequency+1.42 (stride frequency = Hz). Colour code: red, stilts; blue, normal; yellow, stumps I; green, stumps II.