Saber-Toothed Cats and Other Fossil Cats of Anza-Borrego Desert State Park
Predators of Ancient Anza-Borrego

The fossil record of Anza-Borrego Desert State Park preserves evidence of some of North America's most impressive predators. Members of the cat family, Felidae, occupied a variety of ecological roles in the ancient landscapes of southern California, ranging from stealthy ambush hunters to the famous saber-toothed cats.

These predators lived alongside horses, camels, mammoths, ground sloths, antelope, and other mammals that inhabited the river valleys, grasslands, and floodplains of the region during the Pliocene and Pleistocene.

The Cat Family in Ancient California
Cats are among the most specialized carnivores in the mammalian world. Their adaptations for stalking, pouncing, and capturing prey made them highly successful predators throughout North America.

The fossil deposits of Anza-Borrego preserve remains of several members of the cat family. These include both saber-toothed cats and forms related to modern mountain lions and smaller wild cats.

Although less common than herbivores such as horses and camels, cat fossils provide valuable information about predator-prey relationships and ecosystem structure in ancient environments.

The Saber-Toothed Cat
The most famous fossil cat associated with Ice Age North America is the saber-toothed cat, Smilodon. Equipped with elongated canine teeth and powerful forelimbs, Smilodon was one of the dominant predators of the late Pleistocene.

Saber-toothed cats likely hunted large herbivores including horses, camels, and young proboscideans. Their fossils help scientists understand the complex food webs that existed in southern California before the extinction of many large mammals at the end of the Ice Age.

The presence of saber-toothed cats demonstrates that Anza-Borrego once supported abundant populations of large prey animals capable of sustaining major predators.

Relatives of Modern Cats
In addition to saber-toothed cats, the fossil record includes species related to living members of the cat family. Fossils attributable to cougar-like cats provide evidence that many modern predatory adaptations had already evolved by the Pliocene and Pleistocene.
These animals occupied habitats very different from today's desert environment. Streams, wetlands, woodlands, and open grasslands provided cover for predators and supported a rich diversity of prey.

What Cat Fossils Tell Us
Fossil cats help scientists reconstruct:
  • Ancient food webs
  • Predator-prey relationships
  • Mammalian evolution
  • Environmental change through time
  • The structure of prehistoric ecosystems
Because large predators occur near the top of the food chain, their presence indicates healthy and diverse animal communities.
The discovery of cat fossils alongside horses, camels, mammoths, and ground sloths provides evidence for complex ecosystems that once flourished in the Anza-Borrego region.

Explore a Fossil in 3D
Rotate, zoom, and examine this specimen from the Anza-Borrego Desert State Park collections.
​
Interactive 3D Model: Felis (size of Rexroadensis)
Specimen Information
  • Catalog Number: IVCM317 V1076
  • Element: Dentary
  • Formation: Hueso
  • Epoch: Pleistocene
  • Group: Palm Spring
  • Age: Blancan and/or Irvingtonian
  • Locality: Fish Creek / Vallecito Creek
  • Scanned using Agisoft Metashape
  • Specimen © California State Parks. 3D model produced by the Anza-Borrego Desert State Park Paleontology Society.
Why Anza-Borrego Matters
Anza-Borrego Desert State Park preserves one of the richest records of late Cenozoic mammals in North America. Fossil cats are an important component of this record and help document the evolution of carnivores during the final stages of North American mammalian history.

Together with other fossil mammals, the felids of Anza-Borrego reveal a landscape that was once far greener and biologically richer than the desert seen today.

The Fossil Record
  • Cheetah-like cat (Miracinonyx inexpectus)
  • Jaguar (Panthera onca)
  • Rexroad cat (Felis rexroadensis)
  • Bobcat (Felidae rufus)
  • Gracile Sabertooth (Smilodon gracilis)

Quick Facts
  • Family: Felidae
  • Includes: Saber-toothed cats, cougar-like cats, and other fossil felids
  • Famous species: Smilodon
  • Age: Pliocene and Pleistocene
  • Role: Apex predators and carnivores
  • Location: Anza-Borrego Desert State Park, California

Learn More
Read Chapter 12, "The Small Carnivorans: Canids, Felids, Procyonids, Mustelids," in Fossil Treasures of the Anza-Borrego Desert for a detailed discussion of fossil cats and the important discoveries from Anza-Borrego Desert State Park.