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Fig. 7. Approximate lines of action for selected hindlimb muscles of the guinea
fowl. Blue solid lines and solid red lines indicate the lines of action for
stance and swing-phase muscles, respectively, that significantly increase
energy use in response to a load on the distal limb. The lines of action are
drawn to show the major actions of the muscles at the joints, and do not
necessarily indicate precisely the muscle origins and insertions or to
quantitatively indicate the moment arms.