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. 2022 Apr 6;289(1972):20212773. doi: 10.1098/rspb.2021.2773

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© 2022 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — Walrus rostra from mediaeval Kyiv: (a) complete modern skull for comparison, with a line indicating the plane of rostrum removal; (b) anterior view of R64, showing breakage of the tusk sockets for ivory removal; (c) anterior view of R73, showing carving of the anterior surface and rough faceting of the surviving dorsal portion of the left tusk socket; (d) lateral view of R66, showing how the tusk socket was thinned by carving rough parallel facets. Scale bars ca 10 cm. Photographs: James H. Barrett and Natalia Khamaiko. (Online version in colour.)