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Feather types and color traits measured on dorsal and ventral feathers. (a) Body regions from which feathers were collected. (b) Measurement of left color area (LCA) and right color area (RCA) of dorsal and ventral feathers; the red shape indicates the selection of the colored area. (c) Measurement of left color length (LCL) and right color length (RCL) of dorsal and ventral feathers.
