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. 2021 Oct 13;18(183):20210488. doi: 10.1098/rsif.2021.0488

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© 2021 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Phylogenetic tree of contact angle of eggshells for 441 bird species. Bar plots and rings around the phylogeny represent significant predictors of water contact angle (θ_c) in conditionally averaged models. Branch colours show the diversification in θ_c across the phylogeny and branch lengths show ancestral trait estimates. Passerines (pink) and non-passerines (blue) were analysed both together and separately. The bar plots and other rings around the phylogeny represent significant predictors of θ_c in conditionally averaged models. Silhouette illustrations came from PhyloPic (http://phylopic.org), contributed by various authors under public domain licence (see electronic supplementary material).