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Fig. 1. (A) Schematic drawing of the rhynchokinesis protraction angle () and
bill gape (G). (B) Schematic drawing describing the measurement method for the
rhynchokinesis protraction angle. The angle vertex (torsion area) is indicated
by an arrow.
) and
bill gape (G). (B) Schematic drawing describing the measurement method for the
rhynchokinesis protraction angle. The angle vertex (torsion area) is indicated
by an arrow.