‘Dinosaurs updated’ charts the revolutionary discoveries of John Ostrom and Robert Bakker in the 1960s and 1970s. Ostrom adopted a forensic approach to his discovery of Deinonychus (‘terrible claw’). This dinosaur was an intelligent predator with a good turn of pace, much at odds with the prevailing view of dinosaurs as slow witted, sluggish beasts. Ostrom also provided compelling evidence for a theropod dinosaur ancestry of birds. Bakker, Ostrom’s student, compared physiological and anatomical evidence from fossil finds, and determined that dinosaurs had many similarities with mammals and birds, most notably warm blood. This allowed them to dominate Earth in the Mesozoic Era until the mass extinction event 65 Ma.