JEB -- Daley et al. 209 (1): 171 Figure IG5

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Fig. 5. Net changes in gravitational potential ( ${Delta}$ E_P), horizontal and vertical kinetic ( ${Delta}$ E_Kh and ${Delta}$ E_Kv, respectively), and total mechanical energy ( ${Delta}$ E_com) of the COM over the course of one step for the C, U and V treatments. The broken gray line indicates the ${Delta}$ E_P 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.