Fantastic story from Wired. 68 million years ago a T.Rex died. In 2000 a paleontologist dug up its femur. In 2003 scientists started analyzing it, and by 2007 we had machines powerful enough to track 7 samples of protein in the ancient fossilized femur. 5 of those samples closely matched bone collagen of an animal alive today. And what is the T.Rex's most likely descendent???

The humble chicken :-D