Right scapula of Tonsala hildegardae USNM 256518 (A, B), Anhinga anhinga FMNH 339387 (C), and Eudyptula minor FMNH 106505 (D), in dorsal (A), and lateral (B–D) aspects. Left coracoid of Tonsala hildegardae USNM 256518 (E, H), Anhinga anhinga FMNH 339387 (F, I), and Pygoscelis antarctica FMNH 390994 (G, J), in lateral (E–G), and dorsal (H–J), aspects. Partial skeleton of Copepteryx hexeris USNM 486682–cast of KMNH VP 200,006 (K, L) in dorsal aspect. Scale bars equal 25 mm (A–D), 10 mm (E–J), and 25 mm (K, L). Abbreviations: acm, acromial process; acr, acrocoracoid process; apx, cranial apex of sternal keel; cf, coracoid facet; cor, coracoid; fur, furcula; hu, humeral articular facet; nt, medial notch to furcular facet; pro, procoracoid process; vert, dorsal vertebrae; rib, dorsal rib; sf, scapular facet; sca, scapula; str, sternum.