1 of 15 View Caption

Al Hartmann | The Salt Lake Tribune A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in sou Mark Loewen | Courtesy A skeleton of a new tyrannosaur species unveiled Wednesday at the Natural History Museum of Utah, Lythrona Al Hartmann | The Salt Lake Tribune A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in sou Al Hartmann | The Salt Lake Tribune A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in sou Al Hartmann | The Salt Lake Tribune A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in sou Mark Loewen | Courtesy Lythronax argestes, a new tyrannosaur species unveiled Wednesday, was unearthed at the bottom of this clif Al Hartmann | The Salt Lake Tribune A skull with original bones, foreground, with a realistic skull model of a new species of ty Gary Staab | Courtesy A fleshed-out head model of new dinosaur species, Lythronax argestes, that was unveiled at the Natural Hist Lukas Panzarin | Courtesy A skull reconstruction, of Lythronax argestes, the earliest known ancestor of the Tyrannosaurus rex, un Tim Lee | Courtesy Paleontologist Mark Loewen stands in front of a skull of a new dinosaur species unveiled at the Natural Histor Audrey Atuchin | Courtesy An artist's rendering of what a newly discovered dinosaur species might have looked like 80 million yea Al Hartmann | The Salt Lake Tribune A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in sou Lukas Panzarin | Courtesy A skull reconstruction of Lythronax argestes, the earliest known ancestor of the Tyrannosaurus rex, unv Al Hartmann | The Salt Lake Tribune A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in sou Al Hartmann | The Salt Lake Tribune A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in sou