Board Thread:General Discussion/@comment-24374385-20141231151258/@comment-6025261-20151003200538

Here are 4 creatures:

4 mammal like reptiles: Ophiacodon, Dimetrodon, Gorgonops, and Edaphosaurus.

4 big carnivores: Tyrannosaurus rex, Spinosaurus, Giganotosaurus, and Saurophaganax.

4 small carivores: Herrerasaurus, Velociraptor, Compsognathus, and Proceratosaurus.

4 big herbivores: Nothronychus, Brachiosaurus, Triceratops, and Jiangjunosaurus.

4 small herbivores: Psittacosaurus, Kulindadromeus, Microcephale, and Microceratus.

4 pterosaurs: Quetzalcoatlus, Pteranodon, Dimorphodon, and Hatzegopteryx.

4 marine reptiles: Tylosaurus, Kronosaurus, Tanystropheus, and Metriorhynchus.