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. 2021 Feb 8;28:3. doi: 10.1186/s40709-021-00134-9

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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. 14 — Violin plots depicting the distribution of life history traits in the three major amniote clades. Means are represented as solid white points. Productivity expressed as the ratio of productivity (brood size × brood frequency × offspring size) over adult body size to standardize for body size. Red: birds, blue: squamates, yellow: placental mammals. (See Additional file 2: Figure S1 for graphs that also include marsupials and turtles)