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. 2017 Dec 21;14:58. doi: 10.1186/s12983-017-0245-6

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© The Author(s). 2017

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Ancestral states reconstruction for beak length and shape of 13 parid species. The node labels in the length tree (left) are the estimated length of ancestral beaks. The beak profiles corresponding to the nodes in the shape tree (right) are the estimated ancestral beak shapes. The blue profiles are the average shape, while the black profiles are the real shape. The images of beaks were taken from specimen of National Zoological Museum of the Institute of Zoology, Chinese Academy of Sciences