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(Click for frequent words.) 57 tufa towers 56 Modoc Plateau 54 Tomales Bay 54 red legged frogs 52 Farallon Islands 52 Salton Sea 51 Dry Valleys 51 Lassen Volcanic National 51 redwood forest 51 Rancho La Brea 51 Putah Creek 51 Elkhorn Slough 50 JPL Pasadena 50 tiger salamanders 50 tidepools 50 fairy shrimp 49 Henry Cowell Redwoods 49 redwood forests 49 Anza Borrego 49 coastal redwoods 49 Lake Cahuilla 49 Sonora Pass 49 pupfish 49 Lake Lahontan 49 Sunol Regional 49 Ecological Reserve 49 Davidson Seamount 49 sea hydrothermal vents 49 milk vetch 49 Lake Untersee 48 microbialites 48 desert pupfish 48 Parowan Gap 48 Vermilion Cliffs 48 Suisun Marsh 48 leopard frog 48 Yosemite Valley 48 Bolinas Lagoon 48 Olompali 48 red legged frog 48 Siskiyou Mountains 48 Hellhole Canyon 48 Jepson Prairie 48 Carrizo Plain 47 Santa Rosa Plateau 47 sandstone formations 47 streamside habitat 47 MOSS LANDING 47 Diablo Range 47 Sierra Nevada 47 Bolsa Chica 47 oak woodlands 47 yellow legged frog 47 Bodie Hills 47 Yosemite 47 Casmalia 47 canyon 47 Kaibab Plateau 47 sagebrush steppe 47 Mount Tamalpais 47 Mojave Desert 47 Ocotillo Wells 46 juniper forests 46 Montaña de Oro 46 Lassen Peak 46 Anza Borrego Desert 46 Morro Rock 46 Mount Lassen 46 Pardee Reservoir 46 yellow legged frogs 46 redwoods 46 Sierra Nevadas 46 McMurdo Dry Valleys 46 Amargosa River 46 Superstition Mountains 46 California condors 46 Guadalupe Dunes 46 Marin Headlands 46 cutthroat trout 46 Farallons 46 Donner Pass 46 Anacapa Island 46 alpine lakes 46 fringe toed lizard 46 Cosumnes River Preserve 46 sea otters 46 Desolation Wilderness 46 tidal pools 46 Mount Baldy 46 greenback cutthroat trout 45 Palomar Observatory 45 Chiricahua Mountains 45 checkerspot 45 Tecopa 45 Amargosa toad 45 abyssal plain 45 Oceanography La Jolla 45 Homolovi 45 Navajo Sandstone 45 coastal sage scrub 45 Mattole 45 Huachucas 45 mountain plover 45 tadpole shrimp 45 Año Nuevo 45 Aliso Beach 45 Berryessa 45 San Jacinto Mountains 45 Chihuahuan Desert 45 Osa Peninsula 45 Lahontan cutthroat 45 Tioga Pass 45 lava tubes 45 Superstition Wilderness 45 Fakahatchee Strand 45 Silverwood Lake 45 Cachuma 45 mesa tops 45 kelp beds 45 Asilomar 45 otters 44 Sonoran Desert 44 desert tortoises 44 Mount San Jacinto 44 Taurus Littrow 44 Canyon de Chelly 44 Stampede Reservoir 44 glacially carved 44 San Bernardino kangaroo rat 44 tule elk 44 San Justo Reservoir 44 Devil Hole pupfish 44 PRBO Conservation Science 44 Haystack Rock 44 Mohave Desert 44 Mokelumne 44 Lick Observatory 44 Santa Monica Mountains 44 Lagunitas Creek 44 Lahontan cutthroat trout 44 Castlewood Canyon 44 ponderosa pine forest 44 Castle Crags 44 hydrothermal vent 44 desert playa 44 Devils Hole pupfish 44 quaggas 44 tidewater glaciers 44 Tehachapis 44 Santa Rosa Plateau Ecological 44 Cape Perpetua 44 baylands 44 basalt cliffs 44 nesting bald eagles 44 undersea volcanoes 44 Gila Wilderness 44 Mattole River 44 Lake Casitas 44 Malibu Lagoon 44 Buckskin Gulch 44 Mount Diablo 44 past boninite lavas 44 Nojoqui Falls 44 Laboratory JPL Pasadena 44 subalpine 44 Humboldt squid 44 Meteor Crater 44 Lamoille Canyon 44 La Parguera 44 Wallowas 44 Wasatch Range 44 Big Basin Redwoods 44 Vermillion Cliffs 44 limestone outcrops 44 aquatic insect 44 Painted Cave 44 Tule elk 44 Racetrack Playa 44 Coachella Valley Preserve 43 Huachuca Mountains 43 Mount Pinos 43 Strathcona Fiord 43 Bonneville cutthroat 43 Batiquitos Lagoon 43 Warm Springs Dam 43 San Dieguito River 43 humpback chub 43 Sandia Mountains 43 Lake Almanor 43 Moffett Field 43 Palomar Mountain 43 Mokelumne River 43 condors 43 Comb Ridge 43 Utah Canyonlands 43 Lake Cachuma 43 Hetch Hetchy Valley 43 Plumas Eureka State 43 grunion 43 Mummy Range 43 longfin smelt 43 Lake Cuyamaca 43 Transantarctic Mountains 43 oak woodland 43 brook lamprey 43 tidewater goby 43 La Pilita 43 cliff dwellings 43 damselfly 43 ancestral Puebloan 43 Madera Canyon 43 Cape Alava 43 Mojave 43 Ohlone 43 Camanche Reservoir 43 basaltic rocks 43 Gila chub 43 solidified lava flows 43 glacier carved 43 towering redwoods 43 Toiyabe 43 Alisa Viejo 43 Carquinez Strait 43 hot springs 43 Tumacacori 43 salamander 43 granite domes 43 Uvas Canyon County 43 Lemhi Pass 43 Na Pali Coast 43 Ancestral Puebloan 43 silvery minnow 43 Lake Berryessa 43 Zion Narrows 43 Fossil Butte 43 Colorado pikeminnow 43 sauropod skulls 43 Samuel Oschin Telescope 43 Dumbarton Bridge 43 San Elijo Lagoon 43 sea otter 43 Gila trout 43 Agua Hedionda Lagoon 43 Canyonlands National 43 vaquita 43 speckled dace 43 refugium 43 Weminuche 43 arroyo toad 43 aspen grove 43 sparse vegetation 43 Garibaldi Provincial 43 Cuyamaca Mountains 43 Millerton Lake 43 Pacific Flyway 43 receding glacier 43 artesian springs 43 spineflower 43 San Francisco garter snake 42 peninsular bighorn sheep 42 alpine tundra 42 Bolsa Chica Wetlands 42 sandstone buttes 42 Point Conception 42 jumbo squid 42 Coastwalk 42 Volcan Mountain 42 Montara Mountain 42 Farallones 42 Lake Fulmor 42 redwood groves 42 Trinity Alps 42 steelhead trout 42 thermal vents 42 Cahuilla 42 ponderosa pine forests 42 hydrothermal vents 42 Bumpass Hell 42 redwood grove 42 salamander species 42 Chiricahuas 42 aspen groves 42 Owyhee Canyonlands 42 gnatcatchers 42 Baboquivari Mountains 42 Emigrant Trail 42 Algodones Dunes 42 Valles Caldera 42 Woodfords 42 Mother Lode 42 Elkhorns 42 Yaquina Head 42 Valles Marineris 42 Santa Ana sucker 42 Catheys Valley 42 Yellowstone cutthroat 42 Birch Aquarium 42 stonefly 42 extinct volcanoes 42 Grand Canyon 42 Titan Saturn 42 Sisquoc River 42 Sierra Buttes 42 squawfish 42 Stephens kangaroo rat 42 Shi Shi Beach 42 Sangre de Cristo Mountains 42 Bolsa Chica wetlands 42 Tuolumne Meadows 42 Laguna Atascosa 42 Southwestern willow flycatcher 42 Descanso 42 ancient petroglyphs 42 California condor 42 Fallen Leaf 42 Mendenhall Glacier 42 Day Fossil Beds 42 Santa Margarita Ecological 42 LASSEN VOLCANIC NATIONAL PARK 42 Donner Party 42 Lake Mead 42 Wupatki 42 Jedediah Smith 42 Redfish Lake 42 cactus wren 42 Sawtooth Mountains 42 Cataract Canyon 42 Backbone Trail 42 Chippewa Flowage 42 cinder cones 42 Gros Ventre Wilderness 42 nesting bald eagle 42 valley elderberry longhorn beetle 42 desolate expanse 42 roundtail chub 42 kelp forest 42 Kartchner Caverns 42 Polar Regions 42 Spotted Owl 42 Madrona Marsh 42 Loggerhead Shrike 42 Topanga Canyon 42 sparsely vegetated 42 Monterey Bay 42 volcanic crater 42 Markleeville 42 Whiskeytown Lake 42 Pilarcitos Creek 42 salamanders 42 Potrero Canyon 42 Big Sur 42 Tejon Ranch 42 FORT ROSS 42 geologic 42 POINT REYES NATIONAL SEASHORE 42 Uinta Mountains 42 Temescal Valley 42 SHELL BEACH 42 Sognefjord 42 Kettleman Hills 42 petroglyphs 42 Paiute cutthroat trout 42 Lake Tahoe 42 Ecuadorian Andes 42 Bodega Bay 42 Exit Glacier 42 Santa Rosa Mountains 42 Wasatch Mountain 42 redrock canyons 41 Martian equator 41 Umunhum 41 Diporeia 41 pikas 41 wintering waterfowl 41 Neskowin 41 vernal pool habitat 41 Wawona 41 Foxen Canyon Road 41 Gambel quail 41 Tortuguero 41 Na Pali coast 41 Emigrant Wilderness 41 volcanic basalt 41 Moaning Cavern 41 Saola 41 Mount Tallac 41 Wintu 41 Vallecitos 41 Klamath River 41 razorback sucker 41 Aztec Ruins 41 Lava Beds National 41 Lake Tahoe basin 41 Eightmile 41 Altai Mountains 41 freshwater lakes rivers 41 Yurok tribe 41 sandstone bluffs 41 Joshua Tree 41 Calico Ghost Town 41 Absaroka Beartooth Wilderness 41 Antarctic Dry Valleys 41 massifs 41 Wildfire erupts 41 Fort Funston 41 Moapa dace 41 Glen Aulin 41 creosote bush 41 Strawberry Reservoir 41 Vallecito Creek 41 sedimentary deposits 41 SAN JUAN BAUTISTA 41 Point Fermin 41 DEATH VALLEY NATIONAL PARK 41 Nisqually Glacier 41 Emigrant Gap 41 Mojave rattlesnake 41 Sunset Crater 41 Peninsular bighorn sheep 41 Abajo Mountains 41 Ponderosa pines 41 Grinnell Glacier 41 Weminuche Wilderness 41 nonnative trout 41 Cachuma Lake 41 salt flats 41 Dingmans Falls 41 Gakkel Ridge 41 spawning salmon 41 creekbed 41 Santa Monicas 41 chemosynthetic 41 Topock 41 Marin headlands 41 Synthesis NCEAS 41 Kalalau Trail 41 Pescadero Marsh 41 Corte Madera Creek 41 black footed ferret 41 Sol Duc River 41 Yolo Bypass 41 Great Sand Dunes 41 HS Gardena 41 Kaweah River 41 Tuolumne River 41 Miwok 41 Los Vaqueros Reservoir 41 Gusev crater 41 Ballona Creek 41 Monteverde Cloud Forest 41 Sonoran desert 41 Cuyamaca Rancho State 41 dolphins sea lions 41 subterranean caves 41 delta smelt 41 Sierraville 41 limestone karsts 41 Boca Reservoir 41 Olympus Mons 41 sea otter population 41 Carquinez Straits 41 Effie Yeaw Nature 41 Redwoods 41 Mesa Verde 41 Diestelhorst Bridge 41 Linville Gorge 41 Santa Ana Mountains 41 Yellowstone caldera 41 Garrapata 41 Sean Van Sommeran 41 meteor crater 41 Stikine River 41 Vanishing Treasures 41 lava tube 41 speleothems 41 petroglyph 41 Ellwood Mesa 41 Anasazi ruins 41 Manzanar internment camp 41 Pu Luong 41 Hetch Hetchy Reservoir 41 noxious algae blooms 41 Vernal Falls 41 Piuma Road 41 native brook trout 41 kokanee salmon 41 Sierras 41 Uintas 41 frogs toads 41 Morro Strand 41 Rim Trail 41 TAHOE CITY 41 freshwater streams 41 tortoise habitat 41 El Chorro 41 Wildfire Erupts 41 mixed conifer forests 41 Sespe Condor Sanctuary 41 Amargosa 41 endangered desert tortoise 41 Tahquitz Canyon 41 Bitterroot River 41 Palo Verdes 41 Donner Lake 41 rocky ridges 41 pygmy owls 41 Oro Grande 41 Duxbury Reef 41 Lake Wohlford 40 Flume Gorge 40 Cabo Pulmo 40 Sonora Desert 40 marine sediments 40 rare mountain gorillas 40 Coho salmon 40 karst topography 40 Bay checkerspot butterfly 40 Valle Vidal 40 Necanicum 40 Haleakala Crater 40 Yaak Valley 40 Desolation Canyon 40 Kokee 40 Willapa Hills 40 Mount Zirkel Wilderness 40 Merrymeeting Bay 40 Ivory billed woodpecker 40 willow flycatcher 40 condor chick 40 landforms 40 giant sequoia trees 40 Buena Vista Lagoon 40 Norris Geyser Basin 40 volcano caldera 40 Gaviota Coast 40 La Purisima Mission 40 pumice plain 40 Arenal Volcano 40 fiords 40 endangered coho salmon 40 Portola Valley 40 Saddle Peak 40 Morongo Valley 40 Sand Dunes 40 westslope cutthroat trout 40 Econfina Creek 40 Santa Cruz Mountains 40 Michael Studinger 40 Petrified Forest 40 Sespe Wilderness 40 Wasatch Mountains 40 Hood Canal 40 Sabino Canyon 40 Kitt Peak 40 MARIN COUNTY 40 freshwater springs 40 Alpine Amador Calaveras 40 Ecola State 40 Otay River 40 rugged canyon 40 Burgess Shale 40 Mount Bosavi 40 Wildfire Forces Evacuations 40 Guinda 40 Chasma Boreale 40 wilderness 40 Lop Nur 40 Superintendent Don Neubacher 40 Pelagic Shark Research 40 California tiger salamander 40 majestic redwoods 40 Delicate Arch 40 Rincon Mountains 40 Ballona Wetlands 40 Tule Elk 40 Limantour Beach 40 limestone cave 40 southwestern willow flycatcher 40 Piute Mountains 40 Hovenweep 40 buttes 40 Arroyo Mocho 40 Media Newswire.com SANTA CLARA 40 Cypress Slough 40 rugged backcountry 40 Urubamba River 40 Bullfrog Marina 40 Homolovi Ruins 40 snowy plovers 40 tiger salamander 40 Carson Iceberg Wilderness 40 Kokanee salmon 40 Moffet Field 40 alpine meadows 40 Tomales Point 40 subalpine meadows 40 Pilarcitos 40 Arrowbear Lake 40 California clapper rail 40 Crater Lake 40 sagebrush desert 40 Pahranagat 40 Carnelian Bay 40 Goodan Ranch 40 Matanuska Glacier 40 pronghorns 40 Gilf Kebir 40 Taklimakan 40 paleontological dig 40 woodrats 40 Rillito River 40 Titicaca 40 Mount Timpanogos 40 Oceanography UC 40 Jewel Cave 40 Tahoe Basin 40 Los Penasquitos Canyon 40 Santa Rosalia Baja 40 Bolinas 40 Chiricahua leopard frog 40 Hetch Hetchy 40 amphibians 40 springsnail 40 Calico Mountains 40 Taklimakan Desert 40 Idyllwild 40 Paiute 40 Pacheco Pass 40 threatened delta smelt 40 Kolob 39 bristlecone pines 39 Sierra Madre mountains 39 Grand Canyon Parashant 39 conifer forests 39 Overlook Trail 39 Cochise Stronghold 39 redwood trees 39 Wasatch Plateau 39 pygmy rabbits 39 Forest Knolls 39 coast redwoods 39 Jacumba 39 Alameda whipsnake 39 Kilimanjaro glaciers 39 Punta Sur 39 California gnatcatcher 39 endangered mountain gorillas 39 Havasu Canyon 39 Bonneville cutthroat trout 39 Lahontan Cutthroat Trout 39 palm groves cacti 39 spawning habitat 39 Moab UT 39 La Conchita 39 majestic scenery 39 monarch butterflies 39 Cap Wilderness 39 Antelope Canyon 39 volcanic ridge 39 Pecos Wilderness 39 Longfin smelt 39 Yurok Tribe 39 Topanga 39 Terra Meridiani 39 Estrella Mountains 39 Portneuf River 39 treeless expanse 39 Mogollon Rim 39 Catalina Island 39 Mongolia Gobi Desert 39 Selkirk Mountains 39 Tillamook Head 39 Cutthroat trout 39 Pacuare River 39 Manzanar 39 Lochsa River 39 Pinnacles 39 marbled murrelets 39 Siskiyou Crest 39 Sol Duc 39 pygmy rabbit 39 Skilak Lake 39 Martian crater 39 ancient cliff dwellings 39 Bridalveil Fall 39 frontcountry 39 San Joaquin 39 groundwater aquifer 39 hogback 39 Cape Disappointment 39 Ano Nuevo 39 Baboquivari Peak 39 Cordillera Blanca 39 temperate rainforest 39 Mauna Ulu 39 Condor Recovery 39 westslope cutthroat 39 Seccombe Lake 39 Jumbo squid 39 granite outcroppings 39 Genitope Corporation Fremont 39 Peirson milk vetch 39 Candor Chasma 39 Maidu 39 Treebones Resort 39 boulder strewn 39 Trona 39 Palm Springs Aerial Tramway 39 unclimbed peaks 39 Atacama Desert 39 New Melones 39 Tuzigoot 39 JOSHUA TREE NATIONAL PARK 39 San Pedro Martir 39 Gila Cliff Dwellings 39 sulfur springs 39 riparian habitat 39 Martian polar 39 gopher frog 39 Sespe Creek 39 Santa Nella 39 Georgiana Slough 39 Chilkat Bald Eagle 39 Sierra foothills 39 Dominguez Escalante 39 Point Mugu 39 Yurok 39 Grand Staircase Escalante 39 Kumeyaay 39 condor sanctuary 39 tarns 39 Marysville Yuba 39 Giant Sequoias 39 Tonto Creek 39 Syrtis Major 39 Lake Lacawac 39 Sycamore Canyon 39 redhorse suckers 39 Kauai Na Pali 39 Dumont Dunes 39 Bolinas Ridge 39 bull trout 39 Sunol 39 Chihuahuan desert 39 redrock 39 Planetary Society Pasadena 39 phyllosilicate 39 Struve Slough 39 towering cliffs 39 San Timoteo Canyon 39 Laguna Atascosa National 39 Harding Icefield 39 Vallecito 39 California 39 Chihuahuan 39 Oceanside Harbor 39 Tassajara 39 kangaroo rats 39 Inyo Mountains 39 Wassuk Range 39 Santa Cruz 39 Steller sea lions 39 Teton Range 39 interpretive ranger 39 Vertebrate Zoology 39 ancient redwoods 39 Western Snowy Plover 39 Grottos 39 Lompico 39 YOSEMITE NATIONAL PARK 39 Crater Rim Drive 39 volcanic craters 39 Napali Coast 39 giant sequoia tree 39 EBMUD 39 Phong Nha Ke Bang 39 Kvichak River 39 San Gorgonio Pass 39 Stove Prairie 39 wetland habitat 39 Lower Otay Lake 39 species 39 steep canyon 39 Sweetwater Mountains 39 Adam Backlin 39 arid highlands 39 Bering Land 39 Bowers Permanent Collection 39 backcountry 39 dense tropical rainforest 39 cenote 39 Romberg Tiburon Center 39 snowy plover 39 Imperial Sand Dunes 39 Inder Dosanjh Dublin 39 Truckee 39 bunchgrass 39 redband trout 39 waterfalls caves 39 Skeggs Point 39 San Bernadino Mountains 39 Calero Reservoir 39 breathtaking vista 39 Oceano Dunes 39 Leatherback turtles 39 Sonoita Creek 39 karsts 39 Sierra Madre Mountains 39 Tuleyome 39 chaparral 39 mountain meadows 39 Moss Landing 39 Socompa 39 alpine terrain 39 sandstone cliffs 39 Sausalito 39 Swainson hawks 39 anadromous fish 39 Kolob Canyons 39 Wickiup Reservoir 39 spikedace 39 La Jolla Shores 39 Palos Verde 39 Dipsea Trail 39 wildflower hikes 39 Willapa 39 Pismo Beach 39 Jordanelle Reservoir 39 San Elijo 39 Llano Seco 39 awe inspiring vistas 39 vast Gusev Crater 39 Beartooths 39 Rancho Camulos 39 Uvas Canyon 39 desolate deserts 39 Catalina Mountains 39 Bridalveil Falls 39 Almaden Quicksilver 39 Honker Bay 39 limestone karst 38 Delta smelt 38 stratigraphic sequence 38 Alder Creek 38 northlands 38 Giant Sequoia 38 WWII warplane 38 Timpanogos Cave 38 martian 38 La Jolla Underwater 38 volcanic ridges 38 Multi Species 38 Hetch Hetchy reservoir 38 Hells Canyon 38 metamorphic rock 38 Winchuck River 38 gray whale 38 ESRI Redlands 38 checkerspot butterfly 38 Devil Slide 38 dense rainforests 38 Tehipite 38 hidden coves 38 Grande Ronde River 38 Elsinore fault 38 Graveyard Fields 38 Tularosa Basin 38 Fort Cronkhite 38 San Dieguito Lagoon 38 Drakes Estero 38 arid 38 vernal pool species 38 Weddell Sea 38 river otter 38 limestone cavern 38 Dosewallips 38 Rialto Colton 38 Haena 38 stalactites stalagmites 38 Klamath Basin 38 Tecate Peak 38 Picacho Peak 38 volcanic caldera 38 Sanibel Captiva Conservation 38 shorebirds 38 Ambystoma 38 Metolius River 38 Lodi appellation 38 Moonstone Beach 38 fairy chimneys 38 Spinney Mountain 38 TRPA 38 riparian ecosystems 38 Melones 38 Nantahala Gorge 38 Waimea Canyon 38 scrub jay 38 Quetico Provincial Park 38 Castaic Lake 38 Jurupa Mountains 38 Jupiter moon Io 38 Malibou Lake 38 Pajaro Dunes 38 Benicia Martinez 38 brown creeper 38 Oquirrh Mountains 38 Nicoya Peninsula 38 red sandstone cliffs 38 endangered songbird 38 Gullfoss waterfall 38 lush forested 38 Palos Verdes Peninsula 38 Sea Otter 38 habitat 38 Sarapiqui 38 Boar Tusk 38 Winnemucca 38 Rancho del Cielo 38 Brownlee Reservoir 38 desert 38 geologically active 38 dry lakebed 38 Painted Desert 38 limestone caverns 38 Shasta Dam 38 SOLANO COUNTY 38 Gabe Gauthier Buena 38 rugged canyons 38 Simi Hills 38 Sites Reservoir 38 Olivenhain 38 Emigration Canyon 38 Tuttletown 38 Bighorn sheep 38 Middle Fork 38 Jemez Mountains 38 George Radanovich R 38 Kihansi spray toad 38 Calleguas Creek 38 Sand dunes 38 Sutter Buttes 38 Jornada del Muerto 38 aspens 38 Jordanelle 38 scenic overlook 38 horned larks 38 Buttes 38 hiking birding 38 Sipsey Wilderness 38 Coronado Islands 38 Tenaya Lodge 38 montane forests 38 coho salmon 38 Tule Lake 38 Geologically speaking 38 Southern Appalachians 38 Furnace Creek 38 Oso Flaco Lake 38 Sixmile Creek 38 Rio Grande cutthroat trout 38 horned lizards 38 gulches 38 Guatay 38 Cuyama 38 Sierra Madre 38 Point Pinole 38 pristine wilderness 38 Wildfire rages 38 Point Dume 38 canyonlands 38 fulmar 38 Mendocino Headlands 38 Parque Nacional 38 arctic grayling 38 spouting geysers 38 slickrock 38 SEQUOIA NATIONAL FOREST 38 San Bernardino Mountains 38 Steelhead trout 38 ancient Hohokam 38 Fontenelle Reservoir 38 verdant hillsides 38 Chauvet Cave 38 Delta Mendota Canal 38 Chugach Mountains 38 Slickrock 38 Swainson Hawk 38 Linville Falls 38 mountain ranges 38 Tecolote Canyon 38 Wildfire burns homes 38 Arcosanti 38 lush flora 38 Los Glaciares National 38 mussel populations 38 Vallecito Reservoir 38 Agua Mansa 38 burrowing owl 38 Usery Mountain Regional