"Gastornis" has been depicted as predatory. However, some doubt the bird was agile enough to catch fast-moving prey, and have doubts about the beak being right for carnivory. It may be that "Gastornis" was an ambush hunter, or used pack hunting techniques to pursue or ambush prey. If "Gastornis" was a predator, it would have needed some means of hunting prey through the dense forest.