Related by context. Frequent words. (Click for all words.) 59 Bering Strait 59 Beringia 49 Galápagos 49 musk oxen 48 Dall sheep 48 Glacier 48 Turnagain Arm 47 Sandhill cranes 47 Tioga Pass 47 Jurassic Period 47 pronghorns 47 Canyonlands National 46 wintering grounds 46 Ngorongoro Crater 46 Cretaceous Period 46 Isle Royale 46 Bering 46 primeval forest 45 woolly mammoths 45 Aleutians 45 Yellowstone 45 Weddell Sea 45 Andes Mountains 45 glacier 45 trumpeter swans 45 giant tortoise 45 Antarctica 45 Namib Desert 45 glaciers 45 Yukon Kuskokwim Delta 45 Knik Arm 45 Marin Headlands 45 Hells Canyon 45 Pleistocene 45 Aleutian chain 45 glacial retreat 45 Himalayas 45 caribou herds 45 otters 45 Tongariro National 45 mammal 45 Omo River 44 interbred 44 Pacific Ocean 44 Great Slave Lake 44 Steese Highway 44 Pacific Flyway 44 Luangwa 44 megafauna 44 species 44 Antelope Island 44 anatomically modern 44 Bering Sea 44 Arctic tundra 44 Polar Regions 44 Serengeti 44 Magellanic penguins 44 Toutle River 44 Mendenhall Glacier 44 carnivorous dinosaurs 44 Late Cretaceous 44 prehistoric creatures 44 Waterton Lakes National 44 Chena River 43 Galápagos Islands 43 subarctic 43 Abel Tasman 43 Aoraki Mt Cook 43 Admiralty Island 43 rugged coastline 43 overhunting 43 Galapagos islands 43 thylacine 43 temperate forests 43 Humpback whales 43 Galapagos Islands 43 Mesolithic 43 narwhals 43 mammals 43 Grand Canyon 43 African savanna 43 Stikine 43 Atlantic Ocean 43 Seward Peninsula 43 Sonora Pass 43 Organ Pipe Cactus 43 Burgess Shale 43 caribou 43 muskox 43 floe 43 Kluane 43 Anza Borrego 43 Bighorn sheep 43 Knik 42 mating pairs 42 Susitna River 42 Elwha River 42 feathered dinosaurs 42 ptarmigan 42 tundra 42 mammoths