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This photo released by the Natural History Museum of Utah, shows the cliff in the Grand Staircase-Escalante National Monument beneath which the fossilized skeleton of a newly-discovered dinosaur, Lythronax argestes, was found in southern Utah. Scientists say the bone-crushing carnivore is the equivalent of the great uncle of the T. rex. (AP Photo/Natural History Museum of Utah, Mark Loewen) ( CORRECTION Dinosaur Discovery Utah )

This artist's rendering released by the Natural History Museum of Utah, shows a newly-discovered dinosaur, Lythronax argestes, whose fossils have been found in southern Utah. Paleontologists say this proves giant tyrant dinosaurs like the Tyrannosaurus rex were around 10 million years earlier than previously believed. (AP Photo/Natural History Museum of Utah, Audrey Atuchin) ( Dinosaur Discovery Utah )

This photo released by the Natural History Museum of Utah, shows a front view of the skull of the fossilized skeleton of a newly-discovered dinosaur, Lythronax argestes, which was found in southern Utah, and now on the display at the museum in Salt Lake City. Paleontologists who made the discovery believe the dinosaur lived 70-95 million years ago in the late Cretaceous Period, living on a landmass in the flooded the central region of North America. (AP Photo/Natural History Museum of Utah, Mark Loewen) ( Dinosaur Discovery Utah )

This image released by the Natural History Museum of Utah shows a model of a newly-discovered dinosaur, Lythronax argestes, whose fossils have been found in southern Utah. Paleontologists say the bone-crushing carnivore is the equivalent of the great uncle of the T. rex. (AP Photo/Natural History Museum of Utah, Gary Staab) ( Dinosaur Discovery Utah )

A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in southern Utah is revealed at the Utah Museum of Natural History Museum in Salt Lake City by Dr. Mark Loewen and Jospeh Sertich with the Denver Museum of Nature and Science, Wednesday, Nov. 6, 2013. Paleontologists unveiled a new dinosaur discovered four years ago that proves giant tyrant dinosaurs like the Tyrannosaurus rex were around 10 million years earlier than previously believed. (AP Photo/The Salt Lake Tribune, Al Hartmann) ( Dinosaur Discovery-Utah )

A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in southern Utah is revealed at the Utah Museum of Natural History Museum in Salt Lake City, Wednesday, Nov. 6, 2013. Paleontologists unveiled a new dinosaur discovered four years ago that proves giant tyrant dinosaurs like the Tyrannosaurus rex were around 10 million years earlier than previously believed. (AP Photo/The Salt Lake Tribune, Al Hartmann) ( Dinosaur Discovery-Utah )

This photo released by the Natural History Museum of Utah shows the fossilized skeleton of a newly-discovered dinosaur, Lythronax argestes, which was found in southern Utah, on the display at the museum in Salt Lake City. The specimen is 24 feet (8 meters) long and 8 feet (2.4 meters) high. (AP Photo/Natural History Museum of Utah, Mark Loewen) ( Dinosaur Discovery Utah )

A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in southern Utah is revealed at the Utah Museum of Natural History Museum in Salt Lake City, Wednesday, Nov. 6, 2013. Paleontologists unveiled a new dinosaur discovered four years ago that proves giant tyrant dinosaurs like the Tyrannosaurus rex were around 10 million years earlier than previously believed. (AP Photo/The Salt Lake Tribune, Al Hartmann) ( Dinosaur Discovery-Utah )

A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in southern Utah is revealed at the Utah Museum of Natural History Museum in Salt Lake City by Dr. Mark Loewen, Wednesday, Nov. 6, 2013. Paleontologists unveiled a new dinosaur discovered four years ago that proves giant tyrant dinosaurs like the Tyrannosaurus rex were around 10 million years earlier than previously believed. (AP Photo/The Salt Lake Tribune, Al Hartmann) ( Dinosaur Discovery-Utah )

A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in southern Utah is revealed at the Utah Museum of Natural History Museum in Salt Lake City, Wednesday, Nov. 6, 2013. Paleontologists unveiled a new dinosaur discovered four years ago that proves giant tyrant dinosaurs like the Tyrannosaurus rex were around 10 million years earlier than previously believed. (AP Photo/The Salt Lake Tribune, Al Hartmann) ( Dinosaur Discovery-Utah )

Skull with original bones of a new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in southern Utah is revealed at the Utah Museum of Natural History Museum in Salt Lake City, Wednesday, Nov. 6, 2013. Paleontologists unveiled a new dinosaur discovered four years ago that proves giant tyrant dinosaurs like the Tyrannosaurus rex were around 10 million years earlier than previously believed. (AP Photo/The Salt Lake Tribune, Al Hartmann) ( Dinosaur Discovery-Utah )

Realistic model derived from actual skull bones of a new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in southern Utah is revealed at the Utah Museum of Natural History Museum in Salt Lake City, Wednesday, Nov. 6, 2013. Paleontologists unveiled a new dinosaur discovered four years ago that proves giant tyrant dinosaurs like the Tyrannosaurus rex were around 10 million years earlier than previously believed. (AP Photo/The Salt Lake Tribune, Al Hartmann) ( Dinosaur Discovery-Utah )

A new species of tyrannosaur unearthed in Grand Staircase-Escalante National Monument in southern Utah is revealed at the Utah Museum of Natural History Museum in Salt Lake City, Wednesday, Nov. 6, 2013. Paleontologists unveiled a new dinosaur discovered four years ago that proves giant tyrant dinosaurs like the Tyrannosaurus rex were around 10 million years earlier than previously believed. (AP Photo/The Salt Lake Tribune, Al Hartmann) ( Dinosaur Discovery-Utah )