Given the wide diversity of skull shape among enantiornithines, many different dietary specializations must have been present among the group. Some, like "Shenqiornis", had large, robust jaws suitable for eating hard-shelled invertebrates. In longipterygids, the snouts were long and thin with teeth restricted to the tip of the jaws, and they were likely mud-probers (small-toothed species) and fishers (large-toothed species). The short, blunt teeth of "Pengornis" were likely used to feed on soft-bodied arthropods. The strongly hooked talons of bohaiornithids suggest that they were predators of small to medium-sized vertebrates, but their robust teeth instead suggest a diet of hard-shelled animals.