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Fig. 5. Net changes in gravitational potential ({Delta}EP), horizontal and vertical kinetic ({Delta}EKh and {Delta}EKv, respectively), and total mechanical energy ({Delta}Ecom) of the COM over the course of one step for the C, U and V treatments. The broken gray line indicates the {Delta}EP that would occur if the birds fell the entire substrate drop ({Delta}H=8.5 cm). Values are means ± s.e.m for all individuals (N=5). The net changes in energy were determined over the time interval illustrated in Fig. 3B.





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