Avian bone characterization
This protocol is extracted from research article:
Scaling of bird wings and feathers for efficient flight
Sci Adv, Jan 16, 2019; DOI: 10.1126/sciadv.aat4269

The length and diameter of humerus bones were measured with calipers, except for occasional instances where bone length was too large to measure with calipers; long bones such as these were measured with rulers instead. Length was taken as the maximum length of the humerus or the distance between the most proximal point of the head of the humerus to the most distal point of the trochlea of the humerus. Diameter was measured at the center of this length. The mass and wingspan of many of the birds in the collection had been recorded by the museum, and these values were used in plots.

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