The situation for dinosaurs was comparable. From the 1960s onwards, a dinosaur renaissance took place, a quick increase in the number of studies and critical ideas, influenced by the discovery of additional fossils of "Deinonychus", whose spectacular traits refuted what had become entrenched orthodoxy. In 1970, likewise the description of the furry pterosaur "Sordes" began what Robert Bakker named a renaissance of pterosaurs. Especially Kevin Padian propagated the new views, publishing a series of studies depicting pterosaurs as warm-blooded, active and running animals. This coincided with a revival of the German school through the work of Peter Wellnhofer, who in 1970s laid the foundations of modern pterosaur science. In 1978, he published the first pterosaur textbook, the "Handbuch der Paläoherptologie, Teil 19: Pterosauria", and in 1991 the second ever popular science pterosaur book, the "Encyclopedia of Pterosaurs".