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A model of a Dilong Paradoxus, an early tyrannosaur with primitive feathers, in a diorama at the new dinosaur exhibit at the Denver Museum of Nature & Science, called Dinosaurs: Ancient Fossils, New Discoveries. (ELLEN JASKOL/ROCKY MOUNTAIN NEWS)

A model of a Dilong Paradoxus, an early tyrannosaur with primitive feathers, in a diorama at the new dinosaur exhibit at the Denver Museum of Nature & Science, called Dinosaurs: Ancient Fossils, New Discoveries.  (ELLEN JASKOL/ROCKY MOUNTAIN NEWS)