Primary spacing as a field identification criterion for Iberian Chiffchaff

Published on 06 August 2017 in Main articles

By Marcel Gil-Velasco

Abstract Differences in the primary spacing between Iberian Chiffchaff Phylloscopus ibericus and Common Chiffchaff P. collybita are described, based on measurements from good-quality photographs of birds on the breeding grounds. In some situations, this may be a useful supplementary feature for field identification.

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An example of how primary spacing in an Iberian Chiffchaff Phylloscopus ibericus can be assessed on a photo of a bird in the field. Note that space 4–5 (between P4 and P5) is roughly the same as space 3–4 (between P3 and P4). Juankar Andrés