Prehistoric Mammals

Find profiles of prehistoric mammals, including the first mammals that co-existed with the dinosaurs, saber-toothed cats, prehistoric dogs, and the giant mammals of the Cenozoic Era.

  • Illustration of Megazostrodon
    The Evolution of the First Mammals
  • Plesiosaur in water
    10 Steps of Animal Evolution
  • A Leviathan attacks its prey with a mouthful of teeth, some up to 14 inches long
    Facts About Leviathan, the Giant Prehistoric Whale
  • Carbonemys Cofrinii
    250 Million Years of Turtle Evolution
  • Mammoth
    10 Facts About the Woolly Mammoth
  • The skeleton of a saber-toothed tiger, also known as smilodon
    Top 10 Saber-Toothed Tiger Facts
  • The megalodon's closest living relative is the great white shark
    10 Interesting Facts About Megalodon
  • A golden replica of titanoboa devouring a gator
    The 50-Foot-Long, 2,000-Pound Giant Prehistoric Snake, Titanoboa
  • Dimetrodon drawn against the sunset
    10 Facts About Dimetrodon, the Non-Dinosaur Dinosaur
  • dire wolf
    10 Facts About the Dire Wolf
  • Close-Up Of Wolf Against Sky
    40 Million Years of Dog Evolution
  • Mesohippus skeleton
    10 Prehistoric Horses Everyone Should Know
  • Artwork of a sabre-toothed cat (Smilodon sp.)
    Who Would Have Won a Dire Wolf vs. Saber-Toothed Tiger Faceoff?
  • A cougar sitting on a rock
    American Cheetah Facts
  • Mastodon
    10 Facts About Mastodons
  • skull of a horse
    50 Million Years of Horse Evolution
  • Archaeopteryx Lithographica
    10 Missing Links in Vertebrate Evolution
  • The bones of <i>Sarcosuchus</i>, a model at the French National Museum of Natural History in Paris
    10 Facts About Sarcosuchus, the World's Biggest Crocodile
  • 10 Amazing Examples of Convergent Evolution
  • Bronzed skull of a saber-tooth cat
    Saber-Toothed Cats
  • Illustration of Quetzalcoatlus pterosaurs gathering at water
    Quetzalcoatlus, the Feathered Serpent God
  • A complete fossilized skeleton found in rock
    Tetrapods: The Fish Out of Water
  • Elrathia kingii species of Trilobite
    Trilobites, the Dinosaurs of the Arthropod Family
  • A model of the Jamaican giant galliwasp, featuring it's scaly-skinned head
    10 Recently Extinct Reptiles You Should Know About
  • Oil tanks and dead fish
    10 Fish That Have Recently Become Extinct
  • Andrewsarchus
    The 10 Deadliest Prehistoric Mammals
  • Skeleton of the Diprotodon next to a human being at a museum.
    10 Facts About Diprotodon, the Giant Wombat
  • Rock engravings, Arakau, Niger
    Prehistoric Elephants Everyone Should Know
  • Fossil of Eupodophis descouensi, an extinct snake
    Prehistoric Snakes: The Story of Snake Evolution
  • Woolly mammoths
    Giant Mammals of the Cenozoic Era
  • Arctodus Bears in a Territorial Dispute
    Giant Short-Faced Bear (Arctodus Simus) Profile
  • hyaeonodon
    Facts of the Pre-Historic Predator Hyaenodon
  • Artist rendering of the Andrewsarchus.
    Andrewsarchus—the World's Largest Predatory Mammal
  • Toad on the ground
    300 Million Years of Amphibian Evolution
  • The skull of a <i>Basilosaurus</i> on display
    10 Facts About Basilosaurus
  • Illustration of herd of Amebelodons
    Prehistoric Elephants: Pictures and Profiles
  • ambulocetus
    Facts About the Ambulocetus Prehistoric Whale
  • Cave bear (Ursus spelaeus), extinct bear from Pleistocene Epoch, drawing
    Facts About the Cave Bear
  • Paleotologists unearthing a prehistoric whale.
    50 Million Years of Whale Evolution
  • Woolly mammoths, artwork
    50 Million Years of Elephant Evolution
  • Skeleton of American lion (Panthera leo atrox) in museum
    American Lion (Panthera Leo Atrox)
  • Preserved panthera tigris balica skulls
    All About the Bali Tiger
  • The Golden Toad
    10 Extinct or Nearly Extinct Amphibians to Know More About
  • coelacanth fossil at Houston Museum of Natural Science in Houston, Texas
    Overview of the Coelacanth Fish
  • The fish fossil Priscacara clivosa found in Wyoming (probably Green River Formation). It lived in the Early Eocene (50 million years ago).
    500 Million Years of Fish Evolution
  • Magalonyx skeleton
    Giant Ground Sloth (Megalonyx)
  • Amphicyon
    Amphicyon
  • Fossilized skeleton of a European Lion
    European Lion Facts and Figures
  • Dryopithecus=Hispanopithecus laietanus, a basal hominidae from the Spanish Miocene epoch.
    Dryopithecus Facts and Figures
  • elasmotherium
    Elasmotherium
  • Dwarf elephant
    Dwarf Elephant Facts and Figures
  • Lemur
    70 Million Years of Primate Evolution
  • Illustration of a cave lion attacking a stag
    Facts and Figures About the Extinct Eurasian Cave Lion
  • Doedicurus (
    Doedicurus: The Giant Prehistoric Armadillo
  • Barbary Lion (Panthera leo leo) and Cape lion (Panthera leo melanochaita) in Muséum National d'Histoire Naturelle in Paris, France.
    Cape Lion
  • Giant Beaver
    Giant Beaver (Castoroides)
  • Propliopithecus illustration
    Propliopithecus (Aegyptopithecus) Profile
  • A male funnel web spider, Hexathelidae.
    10 Recently Extinct Insects and Invertebrates
  • graphic rendering of dimetrodon in wetlands
    Prehistoric Reptiles That Ruled the Earth Before the Dinosaurs
  • Plesiadapis
    Plesiadapis: Habitat, Behavior, and Diet
  • sivatherium
    Sivatherium: Facts and Figures
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