Fig 2 (IMAGE) University of Bristol Caption Phylogeny of amniotes, showing known reproduction mode and eggshell mineralization, and EER of 80 modern and extinct species, and the estimated ancestral states for all branching points. The dominant inferred state at the origin of amniotes is viviparity with EER. Source: Credit Image from Jiang et al. (2023), with silhouettes of animals from PhyloPic.org, illustrated by Chloé Schmidt, Emily Willoughby, Mark Witton, Dmitry Bogdanov, Nobu Tamura, T. and Michael Keesey. Credit: M.J. Benton, University of Bristol Usage Restrictions Once with release License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.