Marsupials Acanthodians 1 Aquatic 1 Artiodactyls 1 Avian 1 Backboned animals 1 Carnivores 1 Cenozoic Faunas 1 Credonts 1 Elephants and kinn 1 Faunas, Cenozoic 1 Fossils, Vertebrates 1 Hagfishes 1 Jawless Vertebrates 1 Jaws, origin 1 Mammal like reptiles 1 Mammals 1 Medicine 1 Ostracoderms 1 Perissodactyls 1 Placentals 1 Placoderms 1 Primates 1 Primitive Ungulates 1 Rabbits 1 Reptiles, Mammal like 1 Rodents 1 Sharklike fishes 1 Ungulates, Primitive 1 Vetebrates 1