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Forces are normalized to body weight. (A, B) Positive peak Fx. (C, D) Negative peak Fx. (E, F) Peak Fz. (G, H) Mean Fz. (I, J) Peak net force. (A), (C), (E), (G) and (I) are for birds, (B), (D), (F), (H) and (J) are for humans. Regression equations for birds are reported in Table 3.
