Fig 13. Comparison of predictions of the BIRDS model against the observed data for mechanical energy fluctuations.

(A) Percent congruity; r² of predictions is 0.509, root mean square error (RMSE) is 14.895. (B) Relative net vertical displacement of the COM; r² of predictions is -3.569, RMSE is 0.0339. For both variables, the model predicted an influence of body mass, although this is not particularly pronounced for the prediction of percent congruity.