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Phalacrocorax carbo FMNH 339390 (A, B), Fregata minor FMNH 339421 (C, D, F), Phoebastria nigripes FMNH 339601 (E), and Limnofregata azygosternon FMNH PA 719 (G), in medial (A, D); dorsal (B, C); and medial/posterodorsal (E–G) aspects. In (B, C) the articular surface of the otic process of the quadrate is highlighted in magenta. Scale bars equal 5 mm. Abbreviations: op, otic process.
