Figure 4.

Planar coordinate systems for a mother-calf pair of ellipsoidal shapes. L1, L2 and U1, U2 are calf and mother lengths and speeds, respectively. The instantaneous longitudinal and lateral distances between the centers of mass are ξ and η, respectively.

Weihs Journal of Biology 2004 3:8   doi:10.1186/jbiol2
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