Sharks Mammoths Gaiasia Gaiasia jennyae Anatomy Giant Salamander-like Creature Fossils Amphibians Apex Predator Habitat Glyptodont Glyptodonts Saber-toothed Tigers Gorgonopsians Marine Reptiles Pliosaurs Megalodon Mosasaurs Unique Species Unique Features Snakes Ancient Reptiles Prehistoric Fish Mammoth Bones Fish Giant Birds Mastodons Pterosaurs