sentences:  Pointing out that the jaws were dissimilar to the broad, flattened, and spatulate bills of ducks, and that the teeth were not suited for filter-feeding, he dismissed the idea of a duck-like lifestyle for "Istiodactylus".Witton elaborated in 2012 and 2013 on the idea that "Istiodactylus" was a scavenger.Scavenging birds have a mosaic of strong and weak elements in their skulls; they do not have to struggle with their prey, but need to be able to tear and pull morsels from cadavers.