Related by context. Frequent words. (Click for all words.) 62 wooly mammoth 61 horned dinosaur 58 Columbian mammoth 58 Jurassic Period 58 Amur leopard 57 whale skeleton 57 trilobite 56 mosasaur 56 woolly mammoths 56 horned dinosaurs 56 marine reptile 56 Burgess Shale 56 hadrosaur 56 dinosaur skeletons 56 plesiosaurs 56 fossil specimens 56 tyrannosaurus rex 56 dinosaur fossil 55 African savanna 55 baleen whale 54 saber toothed cat 54 tyrannosaur 54 carnivorous dinosaur 54 giant tortoise 54 grassy plains 54 Diplodocus 54 Early Cretaceous 54 Cretaceous Period 54 marine reptiles 54 trilobites 53 Apatosaurus 53 mammoths 53 dinosaur skeleton 53 stegosaurus 53 woolly mammoth 53 hominid species 53 primeval forest 53 Brachiosaurus 53 limestone cave 53 fossilized remains 53 fossils 53 bisons 53 plesiosaur 52 mottled brown 52 coniferous forests 52 Amur tiger 52 preserved fossils 52 dinosaur bones 52 dinosaur fossils 52 river otter 52 tyrannosaurus 52 Gondwanaland 51 triceratops 51 ground sloths 51 hominid fossils 51 ammonites 51 prehistoric creatures 51 prehistoric 51 mastodons 51 trackways 51 limestone caves 51 carnivorous dinosaurs 51 Stegosaurus 50 Arctic foxes 50 brontosaurus 50 crocodilian 50 Tyrannosaurus rex 50 theropod 50 Siberian permafrost 50 musk oxen 50 montane 50 spotted salamanders 50 fossilized bones 50 Late Triassic 50 tule elk 50 Raptorex 50 tigers leopards 50 T rex 50 mastodon 50 lava tubes 50 Selkirk Mountains 50 Book Cliffs 50 gharial 50 Fossilized 50 taxidermied 50 Otzi 50 sloths 50 fossil 50 Tarim Basin 50 Grizzly bears 49 saber toothed tigers 49 grebe 49 feathered dinosaurs 49 braincase 49 Allosaurus 49 arctic fox 49 Ardipithecus ramidus 49 muskox 49 ptarmigan 49 conifer forests 49 placental mammals