bioRxiv preprint doi: https://doi.org/10.1101/2020.10.31.354605; this version posted December 24, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Soaring styles of extinct giant birds and pterosaurs Authors: Yusuke Goto1*, Ken Yoda2, Henri Weimerskirch1, Katsufumi Sato3 Author Affiliation: 1Centre d’Etudes Biologiques Chizé, CNRS – Université de la Rochelle, 79360 Villiers En Bois, France. 2Graduate School of Environmental Studies, Nagoya University, Furo, Chikusa, Nagoya, Japan. 3Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan. Corresponding Author: Yusuke Goto Centre d’Etudes Biologiques Chizé, CNRS – Université de la Rochelle, 79360 Villiers En Bois, France. e-mail:
[email protected] TEL: +814-7136-6220 Keywords: birds, pterosaurs, soaring flight, wind, dynamic soaring, thermal soaring bioRxiv preprint doi: https://doi.org/10.1101/2020.10.31.354605; this version posted December 24, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Summary The largest extinct volant birds (Pelagornis sandersi and Argentavis magnificens) and pterosaurs (Pteranodon and Quetzalcoatlus) are thought to have used wind-dependent soaring flight, similar to modern large birds. There are two types of soaring: thermal soaring, used by condors and frigatebirds, which involves the use of updrafts to ascend and then glide horizontally over the land or the sea; and dynamic soaring, used by albatrosses, which involves the use of wind speed differences with height above the sea surface.