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A new dinosaur track site has been discovered in Alaska's Denali National Park.
Paleontologists from with the Perot Museum of Nature and Science documented the find.
They say it shows multi-generational herds of duck-billed dinosaurs thrived in the ancient ecosystem.
The duck-billed dinosaur track site specimens are on display at the Perot Museum of Nature and Science in Dallas.
The scientific paper on the discovery is published in geology.