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. 2019 Jun 10;5:17. doi: 10.1186/s40851-019-0129-z

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© The Author(s). 2019

Open Access This 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. 15 — The eye muscles of Columba livia in lateral view. a to c represent increasingly deep dissections. a the nictitating membrane and associated ligament, b the intrinsic and extrinsic muscles, c the extrinsic muscles only