Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) sub-adult bull with antlers shedding velvet feeding in tundra pond, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming in fast current during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming upstream between forested banks during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming upstream between forested banks during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming close to surface during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Yva Momatiuk & John Eastcott / Western Grey Kangaroo (Macropus fuliginosus) eating flowers left on grave in Pinnaroo Valley Memorial Park, an environmentally responsible cemetery, Perth, Western Australia, Australia

Yva Momatiuk & John Eastcott / Cape Buffalo (Syncerus caffer) bull with Red-billed Oxpecker (Buphagus erythrorhynchus) pair, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Dall's Sheep (Ovis dalli) ram, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Red Fox (Vulpes vulpes) hunting, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Volcanic Ubehebe Crater, Death Valley National Park, California

Yva Momatiuk & John Eastcott / Snake River and sagebrush prairie, Grand Teton National Park, Wyoming

Yva Momatiuk & John Eastcott / Grand Teton peak with cumulus clouds, Grand Teton National Park, Wyoming

Yva Momatiuk & John Eastcott / Heavy cumulus clouds gather before storm above sagebrush desert, central Wyoming

Yva Momatiuk & John Eastcott / Great Fountain Geyser erupting, Yellowstone National Park, Wyoming

Yva Momatiuk & John Eastcott / Saplings amidst coniferous trees burned by forest fire, Yellowstone National Park, Wyoming

Yva Momatiuk & John Eastcott / Sapling amid coniferous trees burned by forest fire, Yellowstone National Park, Wyoming

Yva Momatiuk & John Eastcott / Timber Wolf (Canis lupus) trio resting together, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Southern Elephant Seal (Mirounga leonina) pups, fat and docile weaners stay together for company and reassurance, St. Andrews Bay, South Georgia Island

Yva Momatiuk & John Eastcott / Southern Elephant Seal (Mirounga leonina) bull roaring at intruder on beach during breeding season, Gold Harbour, South Georgia Island

Yva Momatiuk & John Eastcott / Adelie Penguin (Pygoscelis adeliae) standing on iceberg agitated, western Antarctica

Yva Momatiuk & John Eastcott / Adelie Penguin (Pygoscelis adeliae) chick begging parent for food, western Antarctica

Yva Momatiuk & John Eastcott / Adelie Penguin (Pygoscelis adeliae) flapping wings, Holtedahl Bay, Antarctica

Yva Momatiuk & John Eastcott / Adelie Penguin (Pygoscelis adeliae) spreading and flapping wings, Armstrong Reef, western Antarctica

Yva Momatiuk & John Eastcott / Gentoo Penguin (Pygoscelis papua) parent huddling with two chicks, Booth Island, Antarctica

Yva Momatiuk & John Eastcott / Adelie Penguin (Pygoscelis adeliae) pair, Armstrong Reef, western Antarctica

Yva Momatiuk & John Eastcott / Gentoo Penguin (Pygoscelis papua) on small ice floe, Gerlache Passage, Antarctica

Yva Momatiuk & John Eastcott / Black-browed Albatross (Thalassarche melanophrys) chick, New Island, Falkland Islands

Yva Momatiuk & John Eastcott / Black-browed Albatross (Thalassarche melanophrys) chick, New Island, Falkland Islands

Yva Momatiuk & John Eastcott / African Lion (Panthera leo) courting male and female, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) a semi-aquatic rodent swimming across calm pond behind beaver dam on mountain river, fall foliage reflectd in water, evening, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Gray Wolf (Canis lupus) juvenile, on colorful autumn tundra, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / California Condor (Gymnogyps californianus) adult with wingspan of 9 feet flying, critically endangered, bred in captivity, later released, and wearing radio transmitter, near Zion National Park, Utah

Yva Momatiuk & John Eastcott / Golden sunrise clouds and rising sun in blue sky above sea and waves, Falkland Islands, Atlantic Ocean

Yva Momatiuk & John Eastcott / King Penguin (Aptenodytes patagonicus) rookery, fall, St Andrews Bay, South Georgia Island, Southern Ocean, Antarctic Convergance

Yva Momatiuk & John Eastcott / Massive iceberg floating, smashing into waves and melting rapidly due to gobal warming and rising temperatures of sea and air, near Cumberland Bay, South Georgia Island, Southern Ocean, Antarctic Conv...

Yva Momatiuk & John Eastcott / Gentoo Penguin (Pygoscelis papua) chick begging parent for food, on beach, fall, Gold Harbour, South Georgia Island, Southern Ocean, Antarctic Convergence

Yva Momatiuk & John Eastcott / Antarctic Fur Seal (Arctocephalus gazella) young male on beach, entangled in green fishing net, deadly marine debris floating in all oceans, Gold Harbour, South Georgia Island, Southern Ocean, Antarct...

Yva Momatiuk & John Eastcott / Gentoo Penguin (Pygoscelis papua) flapping wings and walking on beach in surf, evening, Cooper Bay, South Georgia Island, Southern Ocean, Antarctic Convergence

Yva Momatiuk & John Eastcott / King Penguin (Aptenodytes patagonicus) group walking, pointing long bills on gravel beach, fall, Gold Harbour, South Georgia, Southern Ocean, Antarctic Convergence

Yva Momatiuk & John Eastcott / King Penguin (Aptenodytes patagonicus) walking in shallow surf near shore in evening, fall, Gold Harbour, South Georgia Island, Southern Ocean, Antarctic Convergence

Yva Momatiuk & John Eastcott / Macaroni Penguin (Eudyptes chrysolophus) adults walking and one jumping on boulder, along rocky river bank near sea, Cumberland Bay, Southern Ocean, Antarctic Convergance, South Georgia Island

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) 4 month old cubs trying to engage mother in play, Katmai National Park, Alaska

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) 4 month old cubs trying to engage mother in play, Katmai National Park, Alaska

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) mother with 4 month old cub, Katmai National Park, Alaska

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) mother with two 4 month old cubs sitting in grass together, Katmai National Park, Alaska

Yva Momatiuk & John Eastcott / White Rhinoceros (Ceratotherium simum) male, Lake Nakuru National Park, Kenya

Yva Momatiuk & John Eastcott / Masai Giraffe (Giraffa tippelskirchi) mother nursing newborn, Masai Mara, Kenya

Yva Momatiuk & John Eastcott / Waterbuck (Kobus ellipsiprymnus) male with engorged pre-orbital scent-glands below eyes, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Topi (Damaliscus lunatus), Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) bachelor stallions running together in winter, Wyoming

Yva Momatiuk & John Eastcott / Burchell's Zebra (Equus burchellii) foal running and playing on short green grass, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Leopard (Panthera pardus) large male resting after hunt and devouring its kill, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / African Lion (Panthera leo) three month old cub climbing tree stump, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Cheetah (Acinonyx jubatus) portrait of adult female, resting but alert, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / African Elephant (Loxodonta africana) five year old male calves play push and pull games to test strength and establish dominance, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / African Lion (Panthera leo) female portrait of adult female on termite mound, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Cheetah (Acinonyx jubatus) female chasing Thompson's Gazelle (Eudorcas thomsonii) fawn at full-speed, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / African Lion (Panthera leo) adult male with full mane, walking in grassland, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Cheetah (Acinonyx jubatus) adult female, with her cubs resting on termite mound, evening, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Blue Wildebeest (Connochaetes taurinus) herd trying to cross Mara River, fleeing from hungry Crocodiles, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Burchell's Zebra (Equus burchellii) herd Blue Wildebeest (Connochaetes taurinus) and Thomson's Gazelles (Eudorcas thomsonii) congregate near crossing, Mara River, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / African Elephant (Loxodonta africana) male walking in grassland, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Burchell's Zebra (Equus burchellii) and Blue Wildebeest (Connochaetes taurinus) herds grazing together in open grassland during short rainy season in November, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Burchell's Zebra (Equus burchellii) and Blue Wildebeest (Connochaetes taurinus) herds grazing together in open grassland during short rainy season in November, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / African Lion (Panthera leo) adult male followed by curious and playful six and three month old cubs, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Mt Denali and Alaska Range reflected in pond in the morning light, Denali National Park and Preserve, Alaska

Yva Momatiuk & John Eastcott / Cumulus clouds above the open range, Pryor Mountain, Montana

Yva Momatiuk & John Eastcott / Glacial kettle pond with Alaska Range and Mount McKinley in distance, Denali National Park and Preserve, Alaska

Yva Momatiuk & John Eastcott / Arctic Fox (Alopex lagopus) in spring, looking for carrion on sea ice, North Slope near Arctic Ocean, Alaska

Yva Momatiuk & John Eastcott / Arctic Fox (Alopex lagopus) in spring, looking for carrion on sea ice, North Slope near Arctic Ocean, Alaska

Yva Momatiuk & John Eastcott / Arctic Fox (Alopex lagopus) in spring, North Slope, Alaska

Yva Momatiuk & John Eastcott / Atlantic Puffin (Fratercula arctica) pair in their bright breeding colors, during summer breeding season on coastal cliffs, Newfoundland, Canada

Yva Momatiuk & John Eastcott / Atlantic Puffin (Fratercula arctica) adults congregate in colony on coastal cliff during summer breeding season, Newfoundland, Canada

Yva Momatiuk & John Eastcott / Domestic Cattle (Bos taurus) calf walking in meadow of Texas Bluebonnets (Lupinus texensis), North America

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Lone hiker walking on colorful sandstone strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Small sandstone canyon carved by water, exposes strong pattern of parallel lines, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Arctic Fox (Alopex lagopus) pup inspects tundra near family's den, St George Island, The Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Colorful sandstone patterns of lines, ridges and ripples, carved by erosion, are reflected in rainwater pool, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Toadstool Caprocks created by erosion, near Paria River, Grand Staircase-Escalante National Monument, Utah

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) pair of spring cubs, Denali National Park and Preserve, Alaska

Yva Momatiuk & John Eastcott / Alaska Range in spring snow, photographer resting in valley below mountains, Denali National Park and Preserve, Alaska

Yva Momatiuk & John Eastcott / Arctic Fox (Alopex lagopus) in blue phase on coastal cliff, Saint Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Bald Eagle (Haliaeetus leucocephalus) adult flying against clear blue sky, spring, south central Alaska

Yva Momatiuk & John Eastcott / Bald Eagle (Haliaeetus leucocephalus) adult flying against clear blue sky, spring, south central Alaska

Yva Momatiuk & John Eastcott / Coyote (Canis latrans) looking for handouts from tourists, Mather Point parking lot on South Rim, Grand Canyon National Park, Arizona

Yva Momatiuk & John Eastcott / Bald Eagle (Haliaeetus leucocephalus) fishing in the sea, spring, Kenai Peninsula, south central Alaska

Yva Momatiuk & John Eastcott / Bald Eagle (Haliaeetus leucocephalus) fishing in the sea, spring, Kenai Peninsula, south central Alaska

Yva Momatiuk & John Eastcott / Petrified wood log with intricate patterns and colors, Petrified Forest National Park, Arizona

Yva Momatiuk & John Eastcott / California Condor (Gymnogyps californianus) immature bird flying with transmitter attached, critically endangered extinct in wild and recently re-introduced, 9-10 foot wingspan, Marble Canyon, Arizona

Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) young animal munching on alder branches in glacial kettle pond, Denali National Park and Preserve, Alaska

Yva Momatiuk & John Eastcott / Bald Eagle (Haliaeetus leucocephalus) adult portrait, spring, south central Alaska

Yva Momatiuk & John Eastcott / Organ Pipe Cactus (Stenocereus thurberi) with many stalks, spring evening, during drought year, Organ Pipe Cactus National Monument, Arizona

Yva Momatiuk & John Eastcott / Smokestacks spewing smoke, Navajo generating station near Page, Arizona

Yva Momatiuk & John Eastcott / Bald Eagle (Haliaeetus leucocephalus) adult on mud-flats at low-tide, spring, south central Alaska