The pantheon of creatures keeps on rolling out for ARK: Survival Evolved. The latest addition is the aptly named Giganotosaurus; a reptile that very much looks like a Tyrannosaurus Rex that's been fed a healthy diet of growth hormones.
Like so many of the dinosaurs in ARK, the Giganotosaurus was a real-life dinosaur found mainly in the area of the world we now call Argentina (the dinosaurs referred to it as "the place where that big-ass dinosaur lives.")
ARK: Survival Evolved is still in Early Access, but there's a lot of content in place there to satisfy your open-world roaming/survival needs. Provided, that is, another title hasn't captured your fascination today...