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Pelecanus erythrorhynchos FMNH 445082 (A), Phalacrocorax auritus FMNH 348372 (B), Sula sula FMNH 339372 (C), and Fregata magnificens FMNH 339418 (D). Scale bars equal 5 mm. Abbreviations: lc, lateral condyle; lr, lateral ridge of trochlea cartilaginis tibialis; mc, medial condyle; mr, medial ridge of trochlea cartilaginis tibialis.
