Tracking Tyrannosaurs: Meet T. rex's fascinating family, from tiny terrors to feathered giants (National Geographic Kids)This book highlights a newly discovered T. rex relative in China with a coat of downy feathers! This one ton predator is the largest known animal to ever have walked the Earth. This discovery was made public in April 2012, and is a timely addition that sets this book apart from other dinosaur titles. We meet 19 kinds of tyrannosaurs including seven new species discovered in the last two years that came before T. rex. The names are strange, like