Related by context. Frequent words. (Click for all words.) 66 feathered dinosaurs 63 theropod 60 pterosaur 59 hadrosaur 58 theropod dinosaurs 58 Archaeopteryx 58 Raptorex 57 tetrapod 57 Gigantoraptor 57 theropods 57 Tiktaalik 57 Diplodocus 57 horned dinosaur 57 Indohyus 57 baleen whale 57 Ardipithecus 57 carnivorous dinosaur 56 tetrapods 56 placental mammals 56 tyrannosaur 56 melanosomes 56 threadlike 55 Radiocarbon dating 54 crocodilians 54 unicellular 54 inflorescence 54 ALH# 54 carnivorous dinosaurs 53 moonlets 53 Ardipithecus ramidus 53 multicellular 53 khipu 53 Hox genes 53 moa 53 mottled brown 53 Early Cretaceous 52 primate evolution 52 otoliths 52 heterochromatin 52 cartilaginous 52 Nigersaurus 52 LB1 52 pterosaurs 52 morphologies 52 Columbian mammoth 52 KV# 52 hominins 52 stromatolites 52 Kuiper belt 52 whorls 52 Brachiosaurus 52 crocodilian 52 filamentous 52 Apatosaurus 52 heavily cratered 52 sauropod 52 planetary nebulae 51 anthropoid 51 membranous 51 mouthparts 51 Eagle Nebula 51 Homo floresiensis 51 sauropods 51 Jurassic Period 51 subfamily 51 ellipsoid 51 H. erectus 51 forelimbs 51 vertebrate 51 spheroid 51 tyrannosaurus 51 convergent evolution 51 snail shells 51 galaxy NGC 51 H. sapiens 51 setae 51 brownish gray 51 dwarf galaxy 51 bird beak 51 foraminifera 51 marine reptile 51 apelike 51 trilobites 51 Neandertals 50 morphologically 50 phylogenetic tree 50 Neandertal 50 multicellular organisms 50 Australopithecus 50 globular 50 toothed whales 50 plesiosaur 50 panicles 50 collagen fibers 50 genus Homo 50 4 chars 50 anthropoids 50 otolith 50 prokaryotes 50 phyla 50 stalactite