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Fig. 3. (A) This histogram shows the contribution of each wing section to the overall mass moment of inertia (I) of the wing. The moment of inertia calculation employs the sum of the actual and virtual masses shown in B. Each wing section was 1.3 cm wide. (B) This histogram shows the mass and estimated virtual mass of the individual wing sections. Total mass of the standard wing was 8.32 g; the S.D. between the masses of the three original wings was 0.66 g. (C) A silhouette of the standard cockatiel wing divided into 18 sections. The sections incorporating the elbow and wrist joints are labeled.