Paleontologists have found tens of thousands of dinosaur tracks in South America, which offers evidence as to which species were traveling via an ancient coastline. A total of nearly 18,000 tracks -- including 16,600 footprints as well as 1,378 swim tracks and several tail traces -- have been located along the Carreras Pampa track site, an ancient coastline located in Torotoro National Park in central Bolivia, according to a paper published in the journal PLOS One on Wednesday. The ripple marks extend in a northwest-southeast direction, which probably indicate how the dinosaurs and other animals moved along the paleocoastline, according to the paper. Most of the tracks belong to theropods -- a clade of dinosaurs from the Cretaceous period known for their bipedal mode of walking that includ

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