Across the river plains of Late Cretaceous Mongolia, a strange figure wades through the shallows. Its long arms sweep the water’s surface, and its wide, duck-like bill dips beneath the current in search of food and other delicious foods in the swamps. This is Deinocheirus “the terrible hand.” Once a mystery known only by its massive claws, it is now revealed as one of the most extraordinary creatures of its time.