The famed Early Cretaceous rocks of the Crato Formation, in the northeast region of Brazil, have yielded many amazingly detailed fossils, ranging from small scorpions through to huge pterosaurs, which were the first vertebrate animals to evolve true flight, and fish such as Dastilbe. Among the most represented insect groups found at the site are the orthopterans, which today include more than 20,000 living species of grasshoppers, crickets and katydids.