An expanse of ancient rock in the high-altitude Torotoro National Park in Bolivia has been revealed as the largest dinosaur tracksite ever recorded. There, on the eastern flank of the Andes, paleontologists have cataloged the famous Carreras Pampa tracksite, counting almost 18,000 individual dinosaur tracks, made by running, sauntering and even swimming beasts around 70 million years ago – the last age of the dinosaurs before the mass extinction that spelled their demise . The site includes a