Related by context. Frequent words. (Click for all words.) 60 Indohyus 57 theropod 57 Raptorex 56 Ardipithecus ramidus 55 horned dinosaurs 54 crocodilians 54 tyrannosaur 54 Ardipithecus 54 Gansus 54 apelike 54 mammal 54 T.rex 54 chytridiomycosis 54 cassowary 53 echidnas 53 convergent evolution 53 echidna 53 chytrid 53 vertebrate animals 53 plesiosaurs 53 mammals 53 tetrapod 53 microevolution 52 Darwinius 52 bipedalism 52 clouded leopard 52 platypuses 52 vertebrate 52 feathered dinosaurs 52 toothed whales 52 stoat 51 flatworm 51 Bornean 51 baleen whale 51 Great Horned Owl 51 primate evolution 51 Diplodocus 51 LB1 51 goannas 50 theropod dinosaurs 50 macroevolution 50 thylacine 50 sexual dimorphism 50 contagious yawning 50 crocodilian 50 placental mammals 50 morphologically 50 Amur leopard 50 montane 50 quolls 50 carnivorous dinosaurs 50 hadrosaurs 50 Brusatte 50 Tiktaalik 50 hadrosaur 50 frogs toads 50 waterbird 50 amphibian species 50 Sumatran orangutans 49 Tasmanian tiger 49 western lowland gorillas 49 lizards 49 species 49 A. afarensis 49 skink 49 lowland forest 49 garter snake 49 vertebrates 49 pterosaur 49 velociraptor 49 wormlike 49 predatory dinosaurs 49 skinks 49 forelimbs 49 Scientifically speaking 49 Australopithecus 49 snowshoe hare 49 marine iguanas 49 basking shark 49 H. sapiens 49 flatworms 49 kookaburras 49 mammal species 48 arthropod 48 leopard frogs 48 theropods 48 hominid species 48 primate species 48 braincase 48 mammalian species 48 lemur 48 sloths 48 okapi 48 amphibian populations 48 Cambrian explosion 48 avian species 48 mantis shrimp 48 sapiens 48 tapirs 48 Kirtland warbler 48 hominin