How to Find a Dinosaur that Hollywood Dreamed Up

Paleontologist Jim Kirkland believed that some raptors could have grown to the size of those seen in cinemas… but all he had to go on was a single claw. After years searching in the Utah desert, a rock the weight of a school bus appeared to contain the bones of a giant creature - Utahraptor. But what conditions would be needed to allow a creature like this to grow so much larger?