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Figure 1. Skeletons of the Eocene archaeocete whales Dorudon atrox and Maiacetus inuus in swimming pose.

(A, B)– Dorudon atrox (5.0 m; 36.5 Ma) based on UM 101222 and 101215 [11] in lateral and dorsal views, respectively. (C, D)– Maiacetus inuus (2.6 m; 47.5 Ma) based on male specimen GSP-UM 3551 in lateral and dorsal views, respectively.