Do nine-primaried passerines have nine or ten primary feathers? The evolution of a concept

  title={Do nine-primaried passerines have nine or ten primary feathers? The evolution of a concept},
  author={K. Hall},
  journal={Journal of Ornithology},
  • K. Hall
  • Published 2004
  • Biology
  • Journal of Ornithology
The number of primary feathers in a bird’s wing has been used as a systematic character since the first half of the nineteenth century. During the years, though, the definition of which feathers to count as a primary has changed and today the species historically denoted as having only nine primaries are instead said to have, for example, nine ‘functional’ primaries. In this study, I investigated the borderline between ‘nine-primaried’ and ‘ten-primaried’ birds to search for a proper definition… Expand

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