Fig. 7
From: Differences in hindlimb morphology of ducks and chickens: effects of domestication and selection
Curvature of the femur (above) and tibiotarsus (below) in the broiler chicken (Br), layer chicken (L), Pekin commercial hybrid (P) and the mallard (M), in both frontal (a) and lateral (b) views. These bones were taken from birds aged 7 weeks. Note the lateral curvature of both the Pekin and mallard tibiotarsi (a) and the extreme cranial curvature of the broiler tibiotarsus (b)