Related by context. Frequent words. (Click for all words.) 54 Organ Pipe Cactus 54 Conata Basin 53 Giant Sequoia 52 snowy plovers 52 sagebrush habitat 52 rock outcrops 52 Pinnacles 51 trackways 51 Grand Staircase Escalante 50 marbled murrelets 50 Yellowstone ecosystem 50 Waterton Lakes National 50 Ponderosa pines 50 riparian zones 50 Mexican spotted owl 49 bald eagle nests 49 red legged frogs 49 Papahanaumokuakea Marine National 49 grassland habitat 49 coniferous forests 49 nesting bald eagles 49 Little Bighorn Battlefield 49 endangered mountain gorillas 48 Carrizo Plain 48 biodiversity hotspot 48 cypress swamp 48 petroglyphs 48 sandstone formations 48 cliff dwellings 48 eagle nests 48 northern spotted owls 48 horned rhinos 48 tallgrass prairie 48 desert tortoises 48 lava tube 48 Burgess Shale 48 Lassen Volcanic National 48 Monument 48 Greater Yellowstone Ecosystem 48 barrens 48 Teshekpuk Lake 48 temperate forests 48 grizzly bear habitat 48 marbled murrelet 47 trackway 47 buttes 47 lowland forests 47 invertebrate species 47 ponderosa pines 47 Florida panthers 47 Book Cliffs 47 Virunga 47 pronghorns 47 vernal pools 47 #sq km [003] 47 sq. kilometers 47 riparian habitat 46 Sierra Madre Mountains 46 bird species 46 federally endangered 46 mountain pine beetles 46 primeval forest 46 inter tidal 46 roadless lands 46 Wind Cave 46 habitat 46 Ecological Reserve 46 California condors 46 Delicate Arch 46 sage grouse habitat 46 Great Sand Dunes 46 Selkirk Mountains 46 Sea otters 46 hardened lava 46 fossil specimens 46 horned rhinoceros 46 dinosaur footprints 46 fairy shrimp 46 woodland caribou 46 Canyon de Chelly 46 panther habitat 45 bog turtles 45 greater sage grouse 45 plovers 45 wetland habitat 45 federally protected 45 overgrazed 45 bog turtle 45 Sage grouse 45 lava tubes 45 freshwater wetlands 45 San Jacinto Mountains 45 horned dinosaur 45 aspen trees 45 lodgepole pine 45 Midway Atoll 45 Ngorongoro Crater 45 forested wetlands 45 sharp tailed grouse 45 tidal wetlands 45 Sangre de Cristo Mountains