Related by context. Frequent words. (Click for all words.) 57 Indohyus 55 opposable thumb 55 Darwinius 54 Darwin finches 54 flatworm 53 fossilize 53 horned dinosaurs 53 H. floresiensis 53 Smilodon 53 sexual dimorphism 53 ichthyosaur 52 theropod 52 Diplodocus 52 genital organs 52 LB1 52 anglerfish 52 Tiktaalik 52 narwhal 52 peccary 52 insectivores 52 homo erectus 52 plesiosaurs 51 Neandertal 51 Torosaurus 51 A. afarensis 51 forked tail 51 elk bison 51 Neanderthal 51 cartilaginous 50 T.rex 50 Paranthropus 50 mammalian species 50 kipunji 50 macroevolution 50 stickleback 49 medullary bone 49 placental mammals 49 forelimbs 49 caudal 49 tyrannosaur 49 bony plates 49 australopithecines 49 gonadal 49 mottled brown 49 toothed whales 49 fossa 49 herbivorous 49 Raptorex 49 fruitflies 49 hypoplasia 49 microcephalic 49 maxilla 49 vascularized 48 baleen whale 48 theropod dinosaurs 48 speciesism 48 H. erectus 48 eyespots 48 unevolved 48 Tyrannosaurus 48 americanus 48 pileated 48 bowhead 48 prehensile 48 essentialist 48 erectus 48 nonhuman animals 48 forelimb 48 pipefish 48 arthropod 48 Australian aborigines 48 tetrapod 48 zebu 48 Neandertals 48 hibernators 48 Gigantoraptor 48 convergent evolution 48 crocodilian 48 saddleback 48 carnivorous dinosaurs 48 Archaeopteryx 47 Firmicutes 47 carnivorous dinosaur 47 Nile crocodile 47 ungulates 47 bipedalism 47 cortical bone 47 hominid species 47 theropods 47 metacognition 47 Homo habilis 47 afarensis 47 flatworms 47 mosasaurs 47 tyrannosaurus 47 Fossilized 47 H. sapiens 47 anthropomorphize 47 Sociobiology 47 snail shells 47 wooly mammoth