Fig. 1. Diagrammatic view of a guinea fowl standing on the jumping platform. The numbers show the positions marked on each bird. (1) anterior end of sternum; (2) midpoint between synsacrum and base of neck; (3) mid-synsacrum directly above the hip joint; (4) hip joint center; (5) knee joint center; (6) ankle joint center; (7) toe joint center; (8) distal tip of digit III. (Inset) Diagram indicating limb angles. (a) The hip angle was measured between a line parallel to the markers on the back and a line from the hip joint center and the knee joint center; (b) the knee angle was calculated with the law of cosines using constant femur and tibiotarsus segment lengths and the measured distance between the hip and ankle (between a and c); (c) the ankle angle was measured between the tibiotarsus and metatarsus; (d) the toe angle was measured between the tarsometatarsus and digit 3.