A herd of Magyarosaurus.

Magyarosaurus is a species of dwarf sauropod native to Hateg Island. It was only about the size of a horse, unlike most sauropods, which were usually gigantic in size. It was tiny due to insular dwarfism as an effect of living on an island with less food and less space for them to roam. It probably became extinct due to the mass extinction, but it may have became extinct before that happened.