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. 2021 Apr 21;21:58. doi: 10.1186/s12862-021-01788-8

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 1 — The thylacine and canid comparatives. Photographs and crania in dorsal and lateral view of a, e thylacine (Thylacinus cynocephalus), b, f gray wolf (Canis lupus), c, g dingo, and d, h side-striped jackal (Lupulella adustus). Images not to scale. Image credits: a by E.J.K. Baker, Report of the Smithsonian Institution 1904, public domain, colourised by the authors; b by Neil Herbert, Yellowstone National Park, public domain; c by Jarrod Amoore CC BY 2.0; d by T.A. Hermann, NBII WikiCommons, public domain. Images have been adjusted to enhance contrast between subject and background by the authors. Crania e–h are mean shape mesh warps derived from this study’s dataset