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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.
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