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. 2018 Dec 13;8:17806. doi: 10.1038/s41598-018-35827-0

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Log–log regressions (continuous line) and PGLS (dashed line) of (A) olfactory vs respiratory turbinal surface area, (B) respiratory vs total surface area, (C) olfactory vs total surface area, (D) olfactory vs respiratory 3D complexity (CHAR), (E) respiratory 3D complexity (CHAR) vs relative respiratory surface area, and (F) olfactory 3D complexity (CHAR) vs relative olfactory surface area. Colours and symbols: red dots = vermivorous, black squares = carnivorous, and green triangles = omnivorous.