Tyrannosaurus rex, "Terrible Lizard King", lives in our imagination as the greatest beast ever to have walked on Earth's surface. Maybe it's good that T. rex is extinct, but many still existing animals have ancestors who passed the same terrain with this monstrous predator. Many of them have fared well and are equally adept predators as carnivore dinosaurs once were. Which ones are the real heirs of the king's crown? In this detective story we are tracing the closest surviving offspring of this remarkable beast. And the results are amazing.