By Will Dunham (Reuters) - The young Gorgosaurus knew what it liked for dinner. About 75 million years ago in what is now Canada's Alberta province, this fearsome T. rex cousin set about hunting turkey-sized yearlings of a feathered plant-eating dinosaur called Citipes. With such prey numerous, the Gorgosaurus could be picky about what it ate. It dismembered the helpless Citipes and swallowed its meaty legs whole, ignoring the rest of the carcass. Scientists said on Friday they have unearthed fossilized remains of a juvenile Gorgosaurus that was 5 to 7 years old and about 15 feet (4.5 meters) ...