70 million years ago during the Late Cretaceous Period, a pair of Deinocheirus mirificus hang out at a wetland somewhere in eastern Asia. Almost forty feet long from head to tail and weighing up to seven tons, this hump-backed dinosaur is one of the most unusual thus uncovered. It was actually related to fleet-footed “ostrich dinosaurs” like Gallimimus and Struthiomimus, but it seems to have traded away the swiftness of its ancestors for large size and a semi-aquatic lifestyle. Both fish bones and gastroliths (stones swallowed to grind down plant matter) have been found within Deinocheirus remains, suggesting an omnivorous diet consisting of both plants and meat.