Research reviewed 30 July 2026. Scientific interpretations may change as new evidence is published.
Smilodon fatalis was a powerful Ice Age cat with long, flattened upper canine teeth and exceptionally strong front limbs. It lived across much of North America until about 11,000 years ago and hunted large mammals, but it was not a tiger.
| Fact | Answer |
|---|---|
| Scientific name | Smilodon fatalis |
| Name meaning | Fatal knife tooth |
| Time | About 700,000 to 11,000 years ago |
| Fossil locations | Much of North America, with related species farther south |
| Diet | Carnivore |
| Shoulder height | About 1 metre |
| Body length | About 1.75 metres from head to rump |
| Mass | Often estimated at roughly 160 to 280 kilograms |
Smilodon was an extinct member of the cat family. It belonged to a branch called the machairodontines, whose members had enlarged, blade shaped canine teeth. Three Smilodon species are generally recognised. Smilodon fatalis is the best known North American species and the one represented by thousands of fossils from Rancho La Brea in Los Angeles.
The name Smilodon means "knife tooth". People often call it the sabretooth tiger, but it was not a tiger and was not a close member of the modern tiger branch. "Sabre-toothed cat" is the more accurate common name.
The genus Smilodon appeared around 2.5 million years ago, but S. fatalis lived from approximately 700,000 to 11,000 years ago. It occupied much of North America in the Pleistocene Epoch. Fossils occur in caves and sediments across the continent, with the most famous collection coming from the asphalt seeps at Rancho La Brea.
Its habitats varied through time and place, including woodland, scrub and open areas. Other large mammals included bison, camels, horses, ground sloths and mammoths. Dire wolves, American lions and short faced bears competed within the same broad ecosystems.
Smilodon fatalis stood about one metre at the shoulder and was around 1.75 metres long from head to rump. Mass estimates often range from 160 to 280 kilograms. It was shorter in the back than a large modern lion but much more heavily built.
The front legs were exceptionally strong, with broad paws and powerful muscles. The back was relatively short and the tail was much shorter than a lion’s. These proportions suggest an ambush hunter built to grapple with prey at close range rather than chase it over a long distance.
Its upper canine teeth were long, flattened and finely serrated. The jaws could open much wider than those of modern cats. The teeth were impressive but also more vulnerable to bending forces than a lion’s stout canines, so Smilodon probably needed to control struggling prey before making a carefully placed bite.
Smilodon was a carnivore that hunted large mammals. Chemical evidence from bones and teeth suggests prey differed between regions. At Rancho La Brea, possible foods included bison, camels and other medium or large herbivores. It may also have taken younger individuals of very large species.
Scientists reconstruct diet from tooth wear, chemical isotopes, prey abundance and damage on bones. These lines of evidence show broad patterns rather than a perfect menu. Smilodon probably selected prey according to local habitat, season and opportunity.
Rancho La Brea has produced thousands of Smilodon bones. Natural asphalt trapped herbivores, and the struggling animals attracted predators that then became trapped themselves. This unusual process created a large sample containing different ages and body parts.
Skeletons reveal the robust forelimbs, wide opening jaws and short tail. Tooth microwear provides clues about feeding, while healed injuries show that some individuals survived serious damage. Researchers have suggested that survival after injury could indicate social support, but it might also reflect the ability to rest, scavenge or target easier prey. The fossils do not settle the question.
The huge sample is valuable because one skeleton may be unusual, while thousands reveal patterns and variation.
Scientists continue to debate exactly how Smilodon killed prey. A common model has it using strong forelimbs to pin or pull down an animal before delivering a controlled bite to soft tissue in the neck. Other bite positions and hunting sequences are possible, and fossils rarely preserve a complete attack.
Social behaviour is also uncertain. The number of Smilodon fossils at La Brea, injuries that healed and comparisons with living cats have all been used to argue for group living. None is conclusive. Researchers also study why the species disappeared around the end of the Pleistocene, when climate, habitats, prey populations and human activity were all changing.
Smilodon was not a tiger and did not live alongside non bird dinosaurs. Its long canines were not indestructible weapons used to stab through thick bone. A wide gape and specialised bite do not mean it simply had a stronger bite than every modern cat. Fossils also do not prove that Smilodon always hunted in packs, because both social and solitary explanations remain possible.
It was a sabre-toothed cat, but not a tiger. It belonged to a different, extinct branch of the cat family.
The species lived from roughly 700,000 to 11,000 years ago during the Pleistocene.
They occur across much of North America. Rancho La Brea in Los Angeles has produced the largest famous collection.
It stood about one metre at the shoulder and commonly weighed between about 160 and 280 kilograms.
It ate large mammals, with likely prey including bison, camels and other herbivores available in its local habitat.
It probably controlled prey with strong front limbs before making a careful bite into soft tissue, but the exact method remains debated.
Not simply. Its jaw was specialised for an unusually wide gape and a controlled canine bite rather than maximum crushing force.
Scientists do not know. Fossils offer clues that can support social behaviour, but they do not prove permanent group living.
