a Arrow P5a is the feather sheath on the fifth right primary feather. Arrow P7 shows remnants of the third sheath on the seventh primary feather. The sixth primary feather has already molted out and the molt sequence is proceeding in two opposite directions. b Arrow P5b points to the feather sheath on the fifth left primary feather which matches the one preserved on the right hand (arrow P5a). Scale bars are 0.5 cm.