Unlike most pterosaurs (flying reptiles), Tapejara is thought by paleontologists to have primarily eaten plants, rather than meat. Much like modern toucans and hornbills, its toothless, downward-curving beak was adapted for crushing seeds, nuts and tough fruits.

Also like toucans and hornbills, they were likely opportunistic feeders, eating small animals and possibly scavenging carrion when the opportunity presented itself.