For my 32nd Birthday J and I went to the Natural History Museum of Utah. http://nhmu.utah.edu/
One of our corporate mascots and favorite dinosaur is the Allosaurus. This museum has the largest collection of Allosarus bones in the world. The Allosaurus is also Utah's official state fossil. The Allosaurus is smaller than the Tyranosaurs measuring only 25-35 feet, but it has larger more useful arms with bigger claws that could be used to subdue prey. To compare the two here are some toy figures I found in the gift store.
1- T-Rex, 2 - T-Rex, 3 - T-Rex, 4 - Allosaurus, just like a T-Rex, only different.