Hans Sues, Chair, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution holding a cast (right hand) of a Tyrannosaurus Rex tooth for comparison with an actual tooth of the new tyrannosaur Timurlengia euotica, from the Late Cretaceous Period that was
found in the Kyzylkum Desert, Uzbekistan. The fossilized remains of a new horse-sized dinosaur, Timurlengia euotica, reveal how Tyrannosaurus rex and its close relatives became top predators, according to a new study published in the Proceedings of the National Academy of Sciences.
Photo by James Di Loreto / Smithsonian