"18,000 dinosaur tracks discovered along ancient Bolivian coastline — and they set a new record | "

https://www.livescience.com/animals/dinosaurs/18-000-dinosaur-tracks-discovered-along-ancient-bolivian-coastline-and-they-set-a-new-record 

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Most of the tracks belong to bipedal, three-toed dinosaurs known as theropods ..."