Gastornis
Alternatively, they may have been mainly scavengers, omnivores or even herbivores. The large beak of Gastornis would have been suited for crushing seeds and tearing off vegetation. It seems rather big for a purely vegetarian diet. Regardless of what these birds ate, the beak may have been used also for social display – its presence in all known fossils argues against a sexual display role. These contradicting hypotheses, which can't be separated by the evidence, make the paleobiology of Gastornis unclear.