FIGURE 2 in Positive allometry for exaggerated structures in the ceratopsian dinosaur Protoceratops andrewsi supports socio-sexual signaling

FIGURE 2. Changes in skull shape in Protoceratops andrewsi. All skulls are drawn to the same total length and are seen in dorsal view (upper row) and right lateral view (lower row). Left to right (with sources in parentheses) small juveniles (Fastovsky et al., 2011), juveniles (MPC-D 100/526), subadults (MPC-D 100534), putative 'female' morph, putative 'male' morph (both Dodson, 1976). The large fenestrae seen in the smallest animals are supratemporal fenestra and are not homologous with the frills of the fenestra in the larger animals.