Related by context. Frequent words. (Click for all words.) 60 feathered dinosaurs 60 Indohyus 59 fossil 57 systematics 57 ichthyosaur 56 plesiosaurs 56 placental mammals 56 horned dinosaurs 56 carnivorous dinosaurs 55 temperate forests 55 elk bison 55 predatory dinosaurs 55 anthropoids 54 theropod 54 Scientists theorize 54 fossils 54 baleen whale 54 Darwinius 54 peccary 54 theropod dinosaurs 53 Brusatte 53 T.rex 53 macroevolution 53 hominid species 53 marine reptiles 53 H. erectus 53 microfossils 53 hadrosaurs 53 Torosaurus 53 mammals 53 Poinar 53 tetrapod 53 photosynthetic organisms 52 primate evolution 52 trilobites 52 herbivorous 52 dinosaur extinction 52 saber toothed cat 52 monkeys apes 52 sea scorpion 52 crocodilians 52 trilobite 52 Gigantoraptor 52 toothed whales 52 Late Cretaceous 52 fossilization 52 theropods 52 Late Triassic 52 Jurassic Period 52 insects spiders 52 Extinctions 52 unicellular 52 ground sloths 52 fossilized skull 52 flightless birds 52 terrestrial ecosystems 52 Early Cretaceous 51 tyrannosaur 51 vertebrate animals 51 Fossilized 51 baleen whales 51 Cambrian Explosion 51 Cretaceous Period 51 palaeontology 51 biogeography 51 megafauna 51 arthropod 51 tigers leopards 51 mammalian species 51 Archaeopteryx 51 H. sapiens 51 coprolites 51 Columbian mammoth 50 Diplodocus 50 multicellular organisms 50 dinosaur species 50 hominid fossils 50 arthropods 50 Mesozoic 50 marine iguanas 50 crocodilian 50 Ardipithecus ramidus 50 Paleocene 50 vertebrates 50 foraminifera 50 mammals reptiles 50 H. floresiensis 50 erectus 50 palaeontologists 50 Cenozoic 50 A. afarensis 50 prokaryotes 50 fossilize 50 overhunting 50 carnivorous dinosaur 50 kipunji 50 tetrapods 50 Burgess Shale 50 marine reptile 50 abiotic 50 fossilized remains