Fig. S1. Predicted muscle moment arms for hip flexion-extension (left), abduction-adduction (centre) and long axis rotation (right) in Lesothosaurus and other archosaurian bipeds over a range of hip joint flexion-extension angles.

Fig. S2. Average (a) hip extensor, (b) hip flexor, (c) hip abduction, (d) adduction, (e) lateral femoral rotation and (f) medial femoral rotation muscle moment arms normalized by femoral length for Lesothosaurus and other archosaurian bipeds.

Fig. S3. Bar charts illustrating relative iliac proportions in the bipedal archosaurs modelled in this study.

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