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 record-smashing 16,600 three-toed tracks across 1,321 trackways and 289 lone prints, as well as 1,378 swim tracks across 280 trackways. They all belong to theropods , a group that includes all known carnivorous dinosaurs as well as modern birds.

It's an absolutely astonishing site, ma

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