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Humeri of wing‐propelled divers in ventral view: a, Cinclus cinclus (Cinclidae, White‐throated Dipper; USNM 499067); b, Pinguinus impennis (Alcidae, Great Auk; USNM 623465); c, Aptenodytes forsteri (Spheniscidae, Emperor Penguin; AMNH 8110). Anatomical abbreviations: dc, deltopectoral crest; dsp, dorsal supracondylar process; scs, supracoracoideus scar; ts, tricipital sulcus. Scale bars = 1 cm
