 The science and public understanding of dinosaur biology became charged by Bakker's innovative and often controversial ideas and portrayals, including the idea that dinosaurs were in fact warm-blooded animals like mammals and birds.Bakker's drawings of "Deinonychus" and other dinosaurs depicted the animals leaping, running, and charging, and his novel artistic output was accompanied by his writings on paleobiology, with his influential and well-known book "The Dinosaur Heresies", published in 1986, now regarded as a classic.American scientist-artist Gregory Paul, working originally as Bakker's student in the 1970s, became one of the leading illustrators of prehistoric reptiles in the 1980s and has been described by some authors as the paleoartist who may "define modern paleoart more than any other."