sentences:  Instead, the "razor-edged" teeth would be better suited for shearing food than for grabbing fish.Witton also discussed an unpublished Ph.D. thesis by the German palaeontologist Michael Fastnacht, wherein biomechanical calculations predicted that "Istiodactylus" filter-fed in a manner similar to ducks.Witton found that Fastnacht had reconstructed the skull incorrectly, for example by making the rostrum too broad and the jaws too long, resulting in a misleading similarity to the skull of a duck.