Joel Sartore / Photo Ark / Humboldt's flying squirrel (Glaucomys oregonensis) female, portrait, Big Bear Alpine Zoo. Captive, occurs in North America.

Joel Sartore / Photo Ark / Humboldt's flying squirrel (Glaucomys oregonensis) female, feeding, portrait, Big Bear Alpine Zoo. Captive, occurs in North America.

Joel Sartore / Photo Ark / Humboldt's flying squirrel (Glaucomys oregonensis) female, portrait, Big Bear Alpine Zoo. Captive, occurs in North America.

Joel Sartore / Photo Ark / Franklin's ground squirrel (Poliocitellus franklinii) portrait, Wildlife Rescue Center of Minnesota, USA. Captive.

Joel Sartore / Photo Ark / Franklin's ground squirrel (Poliocitellus franklinii) standing on hind legs, portrait, Wildlife Rescue Center of Minnesota, USA. Captive.

Joel Sartore / Photo Ark / Franklin's ground squirrel (Poliocitellus franklinii) walking, portrait, Wildlife Rescue Center of Minnesota, USA. Captive.

Joel Sartore / Photo Ark / Franklin's ground squirrel (Poliocitellus franklinii) feeding, portrait, Wildlife Rescue Center of Minnesota, USA. Captive.

Joel Sartore / Photo Ark / Southern Idaho ground squirrel (Urocitellus endemicus) portrait, Zoo Boise, USA. Captive.

Joel Sartore / Photo Ark / Southern Idaho ground squirrel (Urocitellus endemicus) portrait, Zoo Boise, USA. Captive.

Joel Sartore / Photo Ark / Northern flying squirrel (Glaucomys sabrinus zaphaeus) portrait, Alaska Zoo, USA. Captive.

Jack Dykinga / Sandhill cranes (Grus canadensis) flock in flight with legs extended for landing, Bosque del Apache National Wildlife Refuge, New Mexico, USA. November.

Jack Dykinga / Long Canyon at the confluence with The Gulch, lined with peak colored Cottonwood trees (Populus sp.) and Sage brush (Artemisia sp.) in the foreground, Grand Staircase-Escalante National Monument, Utah...

Jack Dykinga / Two fallen Douglas fir trees (Pseudotsuga menziesii) across a forest trail in temperate rainforest, Hoh Rain Forest, Olympic National Park, Washington, USA. June.

Jack Dykinga / Tickseed (Coreopsis sp.) and Owl clover (Castilleja exserta) carpeting the Carrizo Plain in the foothills of the Temblor Range, Caliente Range foothills. California, USA. March.

Jack Dykinga / Mount Whitney, in the eastern Sierra Nevada mountains, rising above the Alabama Hills in foreground, with a giant lenticular cloud formation rising above the summit, Inyo County, California, USA. Marc...

Jack Dykinga / Salt laden mud and clay from mineral run-off originating in the surrounding bentonite hills and mesas of Mancos shale formations, Cainville Wash near Cathdral Valley, Capitol Reef National Park, Utah,...

Jack Dykinga / Alluvial watercourse drying and cracking after winter El Nino rains with a trails of flowering Desert golds (Geraea canescens) at the base of the Amargosa Mountains, Death Valley National Park, Califo...

Jack Dykinga / Desert golds (Geraea canescens) flowering after El Nino rains among the basalt hillsides of the Black Mountains, Amargosa Range, Death Valley National Park, California, USA. January.

Jack Dykinga / Desert golds (Geraea canescens) flowering after El Nino rains among the basalt hillsides of the Black Mountains, Amargosa Range, Death Valley National Park, California, USA. January.

Jack Dykinga / Dense stands of American aspen (Populus tremuloides) in autumnal colours, Dixie National Forest, Boulder Mountain, Utah, USA. October.

Jack Dykinga / American aspen (Populus tremuloides) forest in autumnal colours, Dixie National Forest, Boulder Mountain, Utah, USA. October.

Jack Dykinga / Turquoise waters of the Little Colorado River near its confluence with Colorado River in the Grand Canyon with dawn light on Chuar Butte, Grand Canyon National Park, Arizona, USA. May, 2014.

Jack Dykinga / Towering cumulus clouds over grassland at sunset, Montana, USA.

Jack Dykinga / Sandhill cranes (Grus Canadensis) flock in flight at sunset with mountains in background, San Bernadino State Wildlife Refuge, New Mexico, USA. January.

Jack Dykinga / The Hall 42 inch telescope at Lowell Observatory at night, in a designated dark sky area, with the Milky Way in sky above, Anderson Mesa Dark Sky Site, Arizona, USA. April, 2022.

Jack Dykinga / Old growth moss covering Western hemlock (Tsuga heterophylla) trees on a misty morning, Jedediah Smith Redwoods State Park, California, USA. June.

Jack Dykinga / California condor (Gymnogyps californianus) taking flight, Marble Canyon, above the Colorado River, Arizona, USA. February. Critically endangered.

Jack Dykinga / Sandhill cranes (Grus Canadensis) migrating flock in flight at sunset against the rising moon, Whitewater Draw, Arizona, USA. October.

Jack Dykinga / Desert lilies (Hesperocallis undulata) flowering among dunes at dawn, Mohawk Dunes, Barry M. Goldwater Range, Sonoran Desert, Arizona, USA. March.

Jack Dykinga / Sandhill crane (Grus canadensis) with Gopher (Geomyida) prey in beak, surrounded by flock of Snow geese (Anser caerulescens) among corn field stubble, Bosque del Apache Refuge, New Mexico, USA. Novemb...

Jack Dykinga / Bighorn sheep, males gathering in groups before rutting season begins, Valley of Fire State Park, Great Basin Desert, Nevada, USA. February.

Jack Dykinga / Three Roosevelt elk (Cervus canadensis roosevelti) bulls jostling and posturing for dominance, Dean Creek wildlife viewing area, Umpqua River basin, Oregon, USA. July.

Jack Dykinga / Ocotillos (Fouquieria splendens) in flower, Eagletail Mountain Wilderness, Arizona, USA. March.

Jack Dykinga / Sandhill crane (Grus Canadensis) taking flight from ice-covered pond, Bosque del Apache National Wildlife Refuge, New Mexico, USA. January.

Jack Dykinga / Triple Arch eroded granite formation at night against star trail rotating around the North Star, Alabama Hills, Eastern Sierra, California, USA. May.

Jack Dykinga / The "Racetrack", a dry lake bed where rocks are blown leaving tracks, given proper conditions of freezing and moisture combined with strong desert winds, Death Valley National Park, California, USA.

Joel Sartore / Photo Ark / San Diego banded gecko (Coleonyx variegatus abbotti) walking portrait, private collection, California, USA. Captive.

Joel Sartore / Photo Ark / San Diego banded gecko (Coleonyx variegatus abbotti) portrait, private collection, California, USA. Captive.

Joel Sartore / Photo Ark / San Diego ring-necked snake (Diadophis punctatus similis) with coiled tail displaying defensive behaviour, portrait, private collection, California, USA. Captive.

Joel Sartore / Photo Ark / San Diego ring-necked snake (Diadophis punctatus similis) with coiled tail displaying defensive behaviour, portrait, private collection, California, USA. Captive.

Joel Sartore / Photo Ark / Mojave patch-nosed snake (Salvadora hexalepis mojavensis) portrait, private collection, California, USA. Captive.

Joel Sartore / Photo Ark / Mojave patch-nosed snake (Salvadora hexalepis mojavensis) portrait, private collection, California, USA. Captive.

Joel Sartore / Photo Ark / Pearl River map turtle (Graptemys pearlensis) portrait, Turtle Survival Center. Captive, occurs in Louisiana and Mississippi, USA. Endangered.

Joel Sartore / Photo Ark / Pearl River map turtle (Graptemys pearlensis) portrait, Turtle Survival Center. Captive, occurs in Louisiana and Mississippi, USA. Endangered.

Joel Sartore / Photo Ark / Pearl River map turtle (Graptemys pearlensis) head portrait, Turtle Survival Center. Captive, occurs in Louisiana and Mississippi, USA. Endangered.

Joel Sartore / Photo Ark / Pearl River map turtle (Graptemys pearlensis) portrait, Turtle Survival Center. Captive, occurs in Louisiana and Mississippi, USA. Endangered.

Joel Sartore / Photo Ark / Pearl River map turtle (Graptemys pearlensis) head portrait, Turtle Survival Center. Captive, occurs in Louisiana and Mississippi, USA. Endangered.

Joel Sartore / Photo Ark / Pearl River map turtle (Graptemys pearlensis) portrait, Turtle Survival Center. Captive, occurs in Louisiana and Mississippi, USA. Endangered.

John Cancalosi / American toad (Anaxyrus americanus) male sitting on a rock and displaying, showing vocal sac. The animal leaves the frame. Maryland, USA.

Jack Dykinga / Monsoon storm with multiple lightning strikes, photographed over a 15 minute period, at sunset with the Picacho Mountains in the background, Sonoran desert, Tucson, Arizona, USA. August.

Jack Dykinga / Monsoon storm with multiple lightning strikes, photographed over a 15 minute period, at sunset with the Picacho Mountains in the background, Sonoran desert, Tucson, Arizona, USA. August.

David Pike / Greater roadrunner (Geococcyx californianus) walking over dry ground, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Greater roadrunner (Geococcyx californianus) walking over dry ground, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Curve-billed thrasher (Toxostoma curvirostre) standing at edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / White tipped dove (Leptotila verreaux) walking along edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Curve-billed thrasher (Toxostoma curvirostre) drinking at edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Audubon's oriole (Icterus graduacauda) perched in treetop, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Curve-billed thrasher (Toxostoma curvirostre) standing on dry ground, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Audubon's oriole (Icterus graduacauda) taking flight from branch, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Curve-billed thrasher (Toxostoma curvirostre) running over dry ground, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Curve-billed thrasher (Toxostoma curvirostre) running over dry ground, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Northern cardinal (Cardinalis cardinalis) male, standing at edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Northern cardinal (Cardinalis cardinalis) female, drinking at edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Green jay (Cyanocorax yncas) landing on a branch, Santa Clara Ranch, near Edinburg, Texas, USA. January.

Jeff Vanuga / Grey wolf (Canis lupus) standing in deep snow, near Madison Junction, Yellowstone National Park, USA. January.

Jeff Vanuga / RF - Steam rising from Crested Pool hot spring in winter, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA. January. (This image may be licensed either as rights managed or royalty free.)

Jeff Vanuga / Dark sky over Wickiup peak in the San Rafael Swell anticline, Colorado Plateau, southern Utah, USA. April, 2019.

Jeff Vanuga / Starry night over Moulten Barn in Mormon Row historic district, Grand Teton National Park, Wyoming, USA. October, 2022.

Jeff Vanuga / RF - Grey wolf (Canis lupus) standing in deep snow, near Madison Junction, Yellowstone National Park, USA. January. (This image may be licensed either as rights managed or royalty free.)

Jeff Vanuga / Steam rising from Heart Spring and the Lion Group of geysers in winter, Geyser Hill, Upper Gesyer Basin, Yellowstone National Park, Wyoming, USA.

Jeff Vanuga / Bison (Bison bison) herd moving slowly through snow in front of a snow coach during a -15F morning, Hayden Valley, Yellowstone National Park, Wyoming, USA. January.

Jeff Vanuga / Frozen landscape around Tangle Creek in the Fountain Paint Pot hot springs area of Yellowstone National Park, Wyoming, USA. February, 2022.

Jeff Vanuga / Bison (Bison bison) herd moving slowly through snow in front of a two snow coaches during a -15F morning, Hayden Valley, Yellowstone National Park, Wyoming, USA. January.

Jeff Vanuga / Snow and frost around Tangle Creek on a winter morning, Lower Geyser Basin, Yellowstone National Park, Wyoming, USA. February, 2022.

Jeff Vanuga / Brine flies (Ephydra sp.) laying eggs and caring for newly deposited eggs in geothermal water, Yellowstone National Park, Wyoming, USA.

Jeff Vanuga / Brine flies (Ephydra sp.) laying eggs and caring for newly deposited eggs in geothermal water, Yellowstone National Park, Wyoming, USA.

Jeff Vanuga / Rare eruption of Steamboat Geyser with steam erupting 400ft into the air, Norris Geyser Basin, Yellowstone National Park, Wyoming, USA. January 23rd, 2022.

Jeff Vanuga / Rare eruption of Steamboat Geyser with steam erupting 400ft into the air, Norris Geyser Basin, Yellowstone National Park, Wyoming, USA. January 23rd, 2022.

Jeff Vanuga / Full moon setting over Madison River, Yellowstone National Park, Wyoming, USA. October, 2020.

Jeff Vanuga / Old Faithful geyser erupting at night under a full moon and a starry sky, Yellowstone National Park, Wyoming, USA. October, 2020.

Jeff Vanuga / Black Pool thermal pool with Milky Way in night sky above, West Thumb Geyser Basin, Yellowstone National Park, Wyoming, USA. July, 2020.

Jeff Vanuga / Morning Glory thermal pool in winter, with yellow and green coloured water caused by thermophilic bacteria, Upper Geyer Basin, Yellowstone National Park, Wyoming, USA. January, 2020.

Jeff Vanuga / Morning Glory thermal pool surrounded by snow in winter, Upper Geyer Basin, Yellowstone National Park, Wyoming, USA. January, 2020.

Jeff Vanuga / Rare eruption of Steamboat Geyser reaching an estimated height of 300-400ft, Norris Geyser Basin, Yellowstone National Park, Wyoming, USA. September 25th, 2019.

Jeff Vanuga / Grey wolf (Canis lupus) wearing radio collar, walking through snow, Yellowstone National Park, Wyoming, USA. February.

Jeff Vanuga / Man darting a Grey wolf (Canis lupus) from a helicopter before fitting a radio collar, Rabbit Creek thermal area, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA. February.

Jeff Vanuga / Grey wolf (Canis lupus) melanistic dark form, trotting over snow, Yellowstone National Park Wyoming, USA. February.

Jeff Vanuga / Grey wolf (Canis lupus) standing in deep snow, near Madison Junction, Yellowstone National Park, Wyoming, USA January.

Jeff Vanuga / Sandstone rock in White Pocket area formation, Vermilion Cliffs National Monument, Arizona, USA. March, 2019.

Jeff Vanuga / Buckhorn panel pictographs, rock art aged 1500 to 4000 years, Buckhorn Wash, San Rafael Swell, Utah, USA. April, 2021.

Jeff Vanuga / Group of people from Wyoming Game and Fish Department attaching a radio collar to a Rocky Mountain bighorn sheep (Ovis canadensis canadensis) for research purposes, Wyoming USA. March, 2016.

Jeff Vanuga / Group of people from Wyoming Game and Fish Department attaching a radio collar to a Rocky Mountain bighorn sheep (Ovis canadensis canadensis) for research purposes, Wyoming USA. March, 2016.

Jeff Vanuga / Red fox (Vulpes vulpes) with missing front leg after being caught in a leg hold trap, walking over snow, northwest Wyoming, USA. April.

Jeff Vanuga / Raven (Corvus corax) stealing food from a knapsack left on a snow mobile, Yellowstone National Park, Wyoming, USA. January.

Joel Sartore / Photo Ark / White-llip globe snail (Mesodon thyroidus) portrait, Kansas, USA. Captive.

Joel Sartore / Photo Ark / White-llip globe snail (Mesodon thyroidus) portrait, Kansas, USA. Captive.