Related by context. Frequent words. (Click for all words.) 68 theropod 66 theropods 65 placental mammals 65 Indohyus 65 subfamily 64 horned dinosaurs 64 plesiosaurs 64 crocodilians 64 theropod dinosaurs 64 morphologically 63 feathered dinosaurs 62 predatory dinosaurs 62 herbivorous 61 sexual dimorphism 61 Diplodocus 61 crocodilian 61 flatworms 61 baleen whale 60 echidnas 60 A. afarensis 60 carnivorous dinosaurs 59 taxon 59 Xenopus 59 flatworm 59 clades 59 apelike 59 wormlike 59 vertebrate animals 59 bisons 59 hominins 58 canadensis 58 Bornean 58 snail shells 58 taxa 58 unicellular 58 bony plates 58 clade 58 platypuses 58 tyrannosaur 58 convergent evolution 58 toothed whales 58 phyla 58 arthropod 58 anthropoids 58 damselfish 58 tetrapod 58 transmissible spongiform encephalopathies 57 genus Homo 57 sauropods 57 forelimb 57 elegans 57 arctic fox 57 termite mounds 57 Ardipithecus 57 hunter gatherer societies 57 Raptorex 57 tetrapods 57 quadrupeds 56 tigers leopards 56 trilobites 56 tusked 56 phylogeny 56 fossa 56 H. erectus 56 refugia 56 forelimbs 56 mammalian species 56 T.rex 56 teosinte 56 pipefish 56 mammals 56 pit vipers 56 phylogenetic tree 56 cartilaginous 56 Early Cretaceous 56 staghorn 56 avian species 56 elk bison 56 velociraptors 56 insects spiders 56 sauropod 56 carnivorous dinosaur 55 H. sapiens 55 mouthparts 55 vertebrates 55 eiders 55 Scientists theorize 55 Ardipithecus ramidus 55 erectus 55 skink 55 arthropods 55 hind limbs 55 Archaeopteryx 55 lineages 55 Australopithecus 55 bird beak 55 phylum 55 Late Cretaceous 55 angiosperms 55 bipedalism 55 protozoan