A remarkable chapter in natural history has just rewritten the auction record books. After an intense bidding battle involving some of the world's wealthiest collectors, a prehistoric giant found a new owner for a price few experts believed possible just a few years ago.

One day about 72 to 66 million years ago, a plant-eating dinosaur became Tyrannosaurus rex food.

"Going through museum collections, my colleagues and I have discovered the first remains of hatchling tyrannosaurs," announced Nick Longrich, paleontologist and evolutionary biologist at the Universit...