A dinosaur track site discovered in Denali National Park in Alaska, US, has suggested that huge herds of duck-billed dinosaurs once flourished in the region.
"We had mom, dad, big brother, big sister and little babies all running around together," said paleontologist Anthony Fiorillo, who is studying the dinosaur tracks. "As I like to tell the park, Denali was a family destination for millions of years, and now we've got the fossil evidence for it."
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