Smilodon is a genus of large predatory cats that lived across the Americas from roughly 2.5 million to 10,000 years ago, through most of the Pleistocene Ice Age.
Not built like a modern big cat
Despite the nickname "saber-toothed tiger," Smilodon wasn't closely related to tigers — it belonged to an entirely separate branch of the cat family. Its most famous feature was its enormous upper canine teeth, which could grow to roughly 18 cm (7 inches) long. Unlike a lion's bite, Smilodon likely didn't rely on raw jaw-clamping power; its skull and neck muscles suggest it used a precise, powerful stabbing bite instead, probably aimed at a downed animal's throat.
Its body was also noticeably different from a modern big cat's — shorter, heavily muscled legs and a powerful build, more suited to ambushing and wrestling large prey to the ground than to a long chase.
The La Brea connection
Thousands of Smilodon fossils have been recovered from the La Brea Tar Pits in Los Angeles, where animals became trapped in sticky asphalt seeps over tens of thousands of years. It's one of the richest sources of Ice Age fossils anywhere in the world, and Smilodon fatalis is now California's official state fossil.
Why it went extinct
Smilodon disappeared around 10,000 years ago, alongside most of North and South America's large Ice Age mammals — likely from a combination of climate change and the disappearance of the large prey animals it depended on.