Related by context. Frequent words. (Click for all words.) 51 dinosaurs roamed 50 Fossilized 47 woolly mammoths 47 potentially habitable 47 radiocarbon dated 47 dinosaur species 47 wolves roam 47 pocket gophers 47 coprolites 47 wooly mammoths 46 endangered mammal 46 saber toothed tigers 46 H. sapiens 46 unicellular 46 Jurassic Period 46 fossilized remains 46 prehistoric 45 Earthlike 45 Cretaceous Period 45 plesiosaurs 45 ichthyosaur 45 Columbian mammoth 45 bears mountain lions 44 horned dinosaur 44 mammoths 44 woolly mammoth 44 reproduce asexually 44 temperate zones 44 H. erectus 44 warmer wetter 44 fossilized 44 megafauna 43 feathered dinosaurs 43 cave dwelling 43 inhospitable environments 43 voracious predators 43 admiral asks 43 limestone cave 43 Migrating birds 43 squirrels rabbits 43 temperate forests 43 fossilized bones 43 tyrannosaur 43 theropod 43 ancient Mayans 42 titanosaur 42 wooly mammoth 42 Arctic foxes 42 hominid species 42 biodiverse 42 grassy plains 42 Falcarius 42 dinosaur fossil 42 placental mammals 42 Siberian tundra 42 erectus 42 Willerslev 42 mastodons 42 Sea otters 42 ancestors migrated 42 Otzi 42 seismically active regions 42 giant squids 42 horned dinosaurs 42 Late Cretaceous 42 medullary bone 42 microfossils 42 elk bison 42 underground burrows 42 Siberian permafrost 42 hunter gatherers 42 Tiktaalik 42 Olduvai Gorge 42 molted 42 extremophiles 42 paleontological 42 meteor impacts 42 Early Cretaceous 42 Indohyus 41 lava tubes 41 dinosaur fossils 41 Raptorex 41 pottery fragments 41 sparse vegetation 41 radiocarbon dating 41 arctic tundra 41 jack rabbits 41 atmospheric methane 41 preserved fossils 41 carnivorous dinosaurs 41 fossils 41 ancient mariners 41 biologically diverse 41 interbred 41 subarctic 41 Salamanders 41 continental crust 41 marine reptiles 41 Mesozoic Era 41 afarensis 41 peccary