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. 2018 Jun 27;159(4):1053–1062. doi: 10.1007/s10336-018-1574-8

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Map showing distribution of locations where body size measurements of Common Bulbuls Pycnonotus barbatus were obtained across West Africa. Sampling points are shaded darker with increasing latitude consistent with Figs. 2, 3 and 4