Next to the dinosaurs, the Smilodon is probably the most famous extinct predator. The creature in this show is based on the biggest saber-toothed cat, “Smilodon fatalis,” which lived in South America up until about 10,000 years ago (late Pleistocene Epoch). The ‘Primeval’ version is fairly close to the original—perhaps a little larger and bulkier. You’d be wise to avoid calling the Smilodon a “saber-tooth tiger;” this cat is not closely related to tigers. Among mammals, the strategy of using long canines to dispatch prey evolved separately four times. There is even a marsupial saber-tooth called Thylacosmilus (“pouch saber”) from the Miocene Epoch.