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. 2013 Mar 13;8(3):e58517. doi: 10.1371/journal.pone.0058517

Figure 5. Relative anterior semicircular canal size in bipedal and quadrupedal dinosaurs.

Figure 5

Anterior semicircular canal (ASC) in (A) Psittacosaurus and (B) Stegosaurus scaled to equivalent relative head size using the allometric factor common to the two functional groups. Although the ASC in the small-bodied biped, Psittacosaurus, is absolutely smaller than in the larger quadruped, Stegosaurus, when the canal systems are scaled as seen here, it is shown that the biped has a markedly larger relative canal. Scale = 10 mm.