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Distal wing elements of a, Cinclus pallasii (Cinclidae, Brown Dipper; USNM 319050); and b, Aptenodytes forsteri (Spheniscidae, Emperor Penguin; AMNH 3767) depicting the range of relative size of free carpals among wing‐propelled divers (dorsal view). Anatomical abbreviations: r, radiale; u, ulnare. Scale bars = 1 cm
