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Gorgosaurus libratus Tyrannosaurus rex Gorgosaurus Diet Evolution Ecological Niches Fossils Ecology Ontogeny Juvenile Dinosaurs Tyrannosaurus Rex Tyrannosaurs mcraeensis Tyrannosaurus mcraeensis Juvenile Tyrannosaurs Tyrannosaurus
Tyrannosaurus mcraeensis, an Older and More Primitive Relative of T. rex, Sparks Debate Among Paleontologists
