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The syrinx, for more than a century an important organ in determining the subdivisions of the avian order Passeriformes (perching birds), was examined in 983 specimens, representing 65 of the 67 families recognized by most modern authorities….
morphology, syrinx, passerine birds
Ames, Peter L.. 1971. "The morphology of the syrinx in passerine birds." Bulletin of the Peabody Museum of Natural History , (37). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/37