Fig. 1. Representative skeletons showing the morphological differences in the rib cage associated with different forms of locomotion in (A) a walking species, cassowary (Casuaris casuaris); (B) a non-specialist, eagle owl (Bubo bubo); and (C) a diving species, razorbill (Alca torda). Uncinate processes are short in walking species, of intermediate length in non-specialists and long in diving species. In all photographs cranial is to the left; scale bar, 5 cm.