Smilodon is an extinct genus of saber-tooth cat that lived in the Americas. The genus has three species, S. fatalis, S. populator, and S. gracilis. Many Smilodons were found in the La Brea tar pits, with complete skeletons and some even with skin. Some Smilodons had canines 7 inches long. It's main habitats were grasslands, preying on animals such as deer and other large herbivores. They may have hunted other carnivores; a Smilodon canine was found in a wolf's skull. This puts them at the rank of top predator. Although the extinction of Smilodon is uncertain, the most popular idea is that as it's habitat was changing, new species became introduced. Many of these animals were fast moving and hard to catch; too hard to catch for Smilodon.