T.rex's big tail was its key to speed and hunting prowess

http://www.biologynews.net/archives/2010/11/15/t_rexs_big_tail_was_its_key_to_speed_and_hunting_prowess

A graduate student from the University of Alberta named Scott Persons has continued the study of the T. Rex and has found that the size of its tail was more than just fat. After studying modern reptiles and comparing them to models of the T. Rex, Persons found that the largest muscles, caudofemoralis muscles, are attached to the upper leg of the animals. The only difference in the T. Rex is that the ribs in their tail are much higher up than that in a modern reptile. This allowed bulkier muscle to build up in the tail, because there was more space for the muscle to build. Persons has estimated that atleast forty-five percent of the T. Rex tail is muscle mass. This muscle allowed the T. Rex to outrun most of the animals in its ecosystem.
I love dinosaurs and one of my favorites is the T. Rex. When I saw this article I knew it was something I wanted to read and learn from. The fact that the T. Rex was a slow animal is a big misconception, when in reality it was as fast as they come. The muscle built up in its "trunk" would be like a modern day body builder. I also find it interesting that the muscles in reptiles today are still similar to the reptiles in the Cretaceous period. I find it amazing what kinds of things we are still finding out with modern science and technology. I can't wait for the day that we can accurately map out every dinosaur species that lived on this earth.