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. 2021 Aug 1;10(8):738. doi: 10.3390/biology10080738

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Allometries between body mass (BM) and the dimensionless number C (blue) and critical C (red) on a double logarithmic scale. Dash lines: 95% confidence interval. (a) two fitting lines of data from Juang et al. [3] with data points of 15 ratite species (excluding kiwi, see discussion). (b) new fitting lines combined with data points of 15 ratite species. (c) the new fitting line of C with three data points of kiwi. (d) the new fitting line of C with six data points of PGOM. Williams’ egg is marked as a light blue star, whereas the Spooner egg is marked as a red star. Purple hollow stars indicate our additional specimens. Points of larger body mass represent Genyornis newtoni, whereas smaller points represent two extinct megapodes, respectively.