We first see the dinosaur...
The tyrannosaurus was the first thing in the museum to come alive. He at first thought it was Cecil playing a sick joke. He eventually found the tyranosaurus at the drinking fountain. It noticed him and gave chase. Larry later found the dinosaur to be quite obedient.
The tyrannosaurus is located at the door to enter the museum. When you enter the Museum of Natural History. right when you enter you will find the T-rex
The fossil was found in some parts of South Dakota, Montana, but mainly in Sheridan, Wyoming.