sentences:  In 1991, the German palaeontologist Peter Wellnhofer compared the front ends of the jaws of "Istiodactylus" with those of a duck, while noting it was not a "duck-billed pterosaur" (as it has been popularly called), due to its strong teeth.He suggested that the alternately meshing teeth and the broad snout indicated a fish-eating animal.Howse and colleagues found that the distinctive teeth indicated a specialised diet or feeding technique, and instead suggested they could have been used to remove chunks of meat from prey or a carcass in the manner of a "cookie cutter" or by biting and twisting the skull.