By Graeme Murray & James Gamble A world-first discovery of the stomach contents of a young Tyrannosaur shows it ate differently than its parents. The prehistoric juvenile picked on prey more suited to its own size say researchers. Hind limbs of smaller dinosaurs were discovered in the exceptionally well-preserved contents of the creature in Canada. A research team from Canada and Japan believes it offers clues as to the diet of these enormous carnivores who ruled our planet as long as 80 million years ago. Scientists say their findings suggest Tyrannosaur prey changed as they developed and gre…