I took my kids to the Pacific Science Center to see the Sue (T-Rex) exhibit and was surprised to learn that Jack Horner was doing a presentation and book signing. For those that don't know, Jack Horner is a world renowned dinosaur expert who served as a technical consultant for the Jurassic Park movies, and Sam Neil's character is loosely based on him. His presentation was fascinating as he explained why he believes that the T-Rex was a scavenger rather than a predator. I found his evidence very compelling. If anybody is interested in knowing his argument, let me know and I will summarize it. At the end of the presentation he had a brief question and answer period where I was able to ask a question that has bugged me for the past year or so: I had learned that the T_Rex was the biggest, baddest carnivorous dino. Was the Spinosaur really much bigger, and why hadn't I ever heard of it before? His answer is that they had known about the Spinosaur for a while, but never knew how big they got until they found a jaw fragment in 1990 that would have made the complete jaw 8 feet long. The Spinosaur attached to this 8' jaw would have been much bigger that the T-Tex. This is why in JP3, the T-Rex was quickly killed by the Spinosaur while it was picking at a dino corpse (implied scavenging).