There are many groups in the vertebrate life of the Mesozoic in Earth history that no longer exist today (e.g., dinosaurs, pterosaurs) or are represented today by very few species (e.g., crocodiles). A very important and really little researched questions is what and how these once animals were fed. The aim of the research is to obtain a more accurate picture of the food processing of each species and the quality of the food consumed through a three-dimensional scanning and comparison of the teeth and the analysis of the wear surfaces on the teeth. How, at what pace and in which groups did the spread of plant-eating start on our Earth after the mass extinction event on the Permian-Triassic mass extinction? Is there a correlation between the appearance of herbivorous vertebrates, which is becoming more frequent at the end of the Jurassic period and the beginning of the Cretaceous period, and the spread of flowering plants?

Late Cretaceous continental sedimentary rocks are becoming rare in Europe. Such sediments and bone remains from some sites are known mostly from the beginning of the Late Cretaceous and then from the very end after a gap of 20-22 million years. This 20 million years of hiatus that lasted from the Cenomanian to the Campanian, only the very rich finds of the Iharkút site are known, as well as scattered finds. What dinosaurs and flying reptiles may have lived in the European archipelago at this gap period? Perhaps those groups that were present at the beginning of the Cretaceous period? Or they disappeared during this period? How did the migration of these groups take place during this period? In connection with this research, we would like to get to know the evolutionary history of the Cretaceous vertebrate fauna of the European archipelago as much as possible. Of particular relevance to these questions are the newly discovered sites in Austria, which provide a wealth of new information to clarify these issues.