Fig. 6
From: Differences in hindlimb morphology of ducks and chickens: effects of domestication and selection
Curvature of the femur (green) and tibiotarsus (red) in the chicken and duck, shown in both frontal and lateral views. The tarsometatarsus (blue) is represented by a straight line since curvatures were not recorded on this bone. Curvatures are exaggerated for clarity. Note the increased lateral curvature of the duck tibiotarsi (and subsequent foot placement) in the medio-lateral plane and the differing directions of tibiotarsal curvature in the cranio-caudal plane. l lateral, m medial, cr cranial, cd caudal