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Table 4 Wing morphology; comparative length differences among five longest primary feathers in the following order: P9, P8, P7, P6, P5

From: DNA reveals long-distance partial migratory behavior in a cryptic owl lineage

  P9 P8 P7 P6 P5
Ninox japonica 15.6 0 3.9 19.6 46.1
Ninox scutulata 16.7 1.6 0 5.3 23.3
Singapore carcass CR059 16.0 0 1.0 15.0 43.0
  1. Measurements start from wing tip, so zero stands for longest primary. Data for Ninox japonica and Ninox scutulata adapted from King (2002)