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. 2017 Dec 12;7:17408. doi: 10.1038/s41598-017-17794-0

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© The Author(s) 2017

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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Scatterplots of olfactory bulb (OB) volume plotted against: (a) brain minus OB volume; and (b) telencephalon minus OB volume. The dotted lines in both scatterplots indicate the 95% prediction interval, which incorporates phylogenetic relatedness. The turkey vulture (Cathartes aura) is indicated by the red circle, the black vulture (Coragyps atratus) by the black circle and all other bird species by open circles. Arrows indicate the two vulture species as well as several species that have notably keen olfaction (Apteryx australis, Fulmarus glacialis, Ardenna tenuirostris and Thalassarche melanophrys).