Recently, Stegoceras fossils were uncovered in Mexico- first time a pachycephalosaur was found in said country. Now, in the northern state of Chihuahua (the dog is named after the state, not the other way around), fossils of a Tyrannosaurus rex have been found for the first time evah!
The fossils consist of teeth and other bits that belonged supossedly to a nine-meter long T-Rex. Before this, the only tyrannosaurs identified from Mexico were Albertosaurus and possibly Labocania.
This makes T-Rex the largest known theropod in the country.