Dinosaurs are one of the best groups for studying the potential effects of paleogeographic changes on evolution because dinosaurs were large animals that were capable of traversing continent scale-distances. For example, early in the Mesozoic Era, when the Earth's continental landmasses were connected, dinosaur faunas worldwide are generally similar. Carnivorous dinosaurs from North America, for example, bear striking resemblance to those from southern Africa, and herbivorous dinosaurs from China resemble those from South America. Later in the Mesozoic Era, however, this is not the case. Dinosaur faunas worldwide became more distinctive from one another due to evolutionary changes and extinction associated with increased isolation.