Genus Smiledon, popularly known as saber-toothed tiger, has been extinct for thousands of years. However, paleontologists have discovered many fossils that give us an idea of what this fierce predator looked like. Some possible synonyms for Genus Smiledon include saber-toothed cat, Smiledon fatalis, Smilodon populator, and Smilodon gracilis. Though these names all refer to the same extinct species, each one has slightly different characteristics. For example, Smilodon populator was larger than its counterparts, while Smilodon gracilis had a more slender build. Regardless of the name, one thing is certain: Genus Smiledon was an impressive and terrifying creature that once roamed the earth.