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Huge trove of dinosaur footprints discovered in AlaskaA "world-class" dinosaur track site discovered in Alaska's Denali National Park shows that herds of duck-billed dinosaurs thrived under the midnight sun."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."The discovery adds to Fiorillo's growing conviction that dinosaurs lived at polar latitudes year-round during the Late Cretaceous Period, about 70 million years ago."Even back then the high latitudes were biologically productive and could support big herds of pretty big animals," said Fiorillo, curator of earth sciences at the Perot Museum of Nature and Science in Dallas.
