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. 2015 Jul 29;9:102. doi: 10.3389/fnana.2015.00102

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Copyright © 2015 Corfield, Price, Iwaniuk, Gutiérrez-Ibáñez, Birkhead and Wylie.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Ancestral character estimates for OB volumes plotted onto an avian phylogeny. This method uses ancestral character estimation to visualize historical character states for OB volumes (plotted as a continuous trait) along the branches of a tree (see methods, Revell, 2013). The trait mapped was the relative size of OBs expressed as the residuals of the best fitting PGLS model of OBs against brain volume-OBs. The phylogeny is largely based on Hackett et al. (2008), with further resolution coming from other studies (see Materials and Methods).