The paleontologist Gregory S. Paul has recently published a paper arguing that Tyrannosaurus rex should be divided into three species, with the other two being the larger and older Tyrannosaurus imperator and the smaller and daintier Tyrannosaurus regina. So far, the argument doesn’t seem to have persuaded the paleontological community that much, and I am inclined to trust their expert judgment on it. Nonetheless, the occasion did inspire me to draw my all-time favorite dinosaur again, so that’s a plus.