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Factor of safety F.S., C number and the phylogenetic relationship of megapodes and Genyornis newtoni. (a) phylogenetic tree of megapodes is based on Shute et al. [34]. (b) F.S. of extinct species were calculated with Williams’ egg (red), Spooner egg (blue), and additional specimen (yellow), respectively. Extant megapodes are illustrated as black dots. (c) different colors of C number indicate identical implication of F.S.
