Related by context. Frequent words. (Click for all words.) 55 vertebrate species 55 mammal species 52 fossilized remains 51 tyrannosaur 50 Poinar 50 fossils 50 amphibian species 49 fossilized bones 48 theropods 48 palaeontologists 48 primate species 48 sauropod 48 Paleontologists 48 trilobites 48 gigatons 48 Denisovans 47 Cretaceous Period 47 pterosaur 47 Archaeopteryx 47 fossil 47 radiocarbon 47 terrestrial ecosystems 47 interglacial 46 hominin 46 radiocarbon dating 46 paleoanthropologist 46 genus Homo 46 dinosaur footprints 46 gigatonnes 46 hominins 46 extinct 46 paleontologists 46 Neandertals 46 hominid 45 western lowland gorillas 45 mammoths 45 marine sediments 45 dinosaurs 45 Ardipithecus 45 carnivorous dinosaurs 45 Neanderthal DNA 45 economically recoverable 44 species 44 hadrosaur 44 taxa 44 fossilized 44 Australopithecus 44 estimate 44 Neandertal 44 Homo sapiens 44 penguin species 44 extinctions 43 avian species 43 Longrich 43 zoologists 43 evolutionary biologists 43 dinosaur fossil 43 tyrannosaurs 43 sauropods 43 glaciologists 43 nesting pairs 43 mastodons 43 dinosaur skeletons 43 lake sediments 43 Geneticists 43 American Religious Identification 43 Paabo 43 dinosaurs roamed 43 Demographers 43 vertebrates 43 atmospheric carbon dioxide 43 phylogeny 43 Homo habilis 43 taxonomists 43 single celled organisms 42 Greenland glaciers 42 baiji 42 Late Cretaceous 42 middens 42 arthropod 42 common ancestor 42 extinct species 42 Australopithecus afarensis 42 Vertebrate Paleontology 42 Biology Letters 42 clades 42 Homo erectus 42 biodiversity hotspots 42 prehistory 42 orchid species 42 botanists 41 Carboniferous 41 heritability 41 lineages 41 habitable planets 41 oxygen isotopes 41 vertebrate 41 genera 41 dinosaur fossils 41 Homo floresiensis 41 frog species