Tyrannosaurus rex, commonly known as T. rex, is a species of theropod dinosaur that lived during the Late Cretaceous Period, 68 to 66 million years ago. Arguably the most famous species of dinosaur, T. rex lived in what is now North America, alongside species such as Ankylosaurus, Edmontosaurus, Pachycephalosaurus, Alamosaurus, Nanotyrannus, and Triceratops. Tyrannosaurus was among many dinosaur species cloned by InGen and settled on the Costa Rican islands of Isla Sorna and Isla Nublar, for use as an attraction for Jurassic Park, and later, Jurassic World.