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Phaethon aethereus FMNH 348136 (A), Sula sula FMNH 339372 (B), Phalacrocorax africanus FMNH 368742 (C), and Phalacrocorax carbo FMNH 339390 (D). Scale bars equal 10 mm. Abbreviations: ehl, furrow for the tendon of musculus extensor hallucis longus; ex, sulcus extensorius; fov, fovea at proximal end of trochlea metatarsi III; int, eminentia intercondylaris.
