Hans Sues, Smithsonian Institution (IMAGE) Smithsonian Caption Hans Sues, Chair, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution is 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. Credit James Di Loreto, Smithsonian. Usage Restrictions News media use only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.