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'Black Beauty' a Tyrannosaurus rex fossil. Minerals stained the bones black during fossilization. Royal Tyrrell Museum

Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. Tyrannosaurus rex lived throughout what is now western North America, at the time an island continent termed Laramidia, with a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 67 to 65.5 million years ago. It was among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event.

Mounted composite cast of Pteranodon longiceps at the American Museum of Natural History, New York.