Matthias Breiter / Bobcat (Lynx rufus) walking in the snow, bobbed tail visible, Kalispell, Montana

Matthias Breiter / Mountain Lion (Puma concolor) in the snow, Kalispell, Montana

Matthias Breiter / Polar Bear (Ursus maritimus) three month old cub looking out of its birth den, vulnerable, Wapusk National Park, Manitoba, Canada

Matthias Breiter / Northern lights or aurora borealis over illuminated tent, boreal forest, North America

Matthias Breiter / Polar Bear (Ursus maritimus) female with twelve week old cub, Canada

Matthias Breiter / Northern lights or aurora borealis over illuminated tent, boreal forest, North America

Matthias Breiter / Northern lights or aurora borealis over boreal forest, North America

Matthias Breiter / Black Bear (Ursus americanus) cub in tree safe from danger, Orr, Minnesota

Matthias Breiter / Black Bear (Ursus americanus) juvenile male in tree, Orr, Minnesota

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) adult female nursing her two yearling cubs on sedge flats, Katmai National Park, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) young female looking for fish, Katmai National Park, Alaska

Matthias Breiter / Polar Bear (Ursus maritimus) male resting on ice, Churchill, Manitoba, Canada

Matthias Breiter / Polar Bear (Ursus maritimus) cub standing, Churchill, Manitoba, Canada

Matthias Breiter / Rainbow Lorikeet (Trichoglossus haematodus) on branch, Noonamah, Northern Territory, Australia

Matthias Breiter / Rainbow Lorikeet (Trichoglossus haematodus) pair interacting, Noonamah, Northern Territory, Australia

Matthias Breiter / Polar Bear (Ursus maritimus) adult male charging opponent, Churchill, Manitoba, Canada

Matthias Breiter / Polar Bear (Ursus maritimus) mother with cub in snow, Churchill, Manitoba, Canada

Matthias Breiter / Polar Bear (Ursus maritimus) mother with cub, Churchill, Manitoba, Canada

Matthias Breiter / Caribou (Rangifer tarandus) two males sparring, Denali National Park and Preserve, Alaska

Matthias Breiter / Polar Bear (Ursus maritimus) adult portrait, Churchill, Manitoba, Canada

Matthias Breiter / Sockeye Salmon (Oncorhynchus nerka) jumping upstream during spawning season, Brooks Falls, Katmai National Park, Alaska

Matthias Breiter / Pacific Walrus (Odobenus rosmarus divergens) male portrait, Round Island, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) adolescent catching salmon above Brooks Falls, Katmai National Park, Alaska

Matthias Breiter / Great Bowerbird (Chlamydera nuchalis) male displaying in front of female in lek, Australia

Matthias Breiter / American Beaver (Castor canadensis) swimming with branch, Denali National Park and Preserve, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) on landspit in early morning haze, Katmai National Park, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) cub, Katmai National Park, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) cubs playing, Katmai National Park, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) fishing for spawning salmon at a waterfall, Katmai National Park, Alaska

Matthias Breiter / Caribou (Rangifer tarandus) calf running on the tundra, Arctic National Wildlife Refuge, Alaska

Matthias Breiter / Sockeye Salmon (Oncorhynchus nerka) jumping upstream during spawning season, Brooks Falls, Katmai National Park, Alaska

Matthias Breiter / Dall's Sheep (Ovis dalli) ram portrait on rock outcrop, Denali National Park and Preserve, Alaska

Matthias Breiter / Caribou (Rangifer tarandus) two males sparring, Denali National Park and Preserve, Alaska

Matthias Breiter / Common Porcupine (Erethizon dorsatum) in willow tree near the Denali highway, Alaska

Matthias Breiter / Two climbers at Ruth Glacier, with Mt McKinley towering above them, Denali National Park and Preserve, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) on landspit silhouetted against Mt Katolinat, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) cub in forest in fall, Katmai National Park, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) cubs silhouetted against water at sunrise, Katmai National Park, Alaska

Matthias Breiter / Dall's Sheep (Ovis dalli) ram with split horn, Denali National Park and Preserve, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) with seagulls at the mouth of Brooks River in morning fog, Katmai National Park, Alaska

Matthias Breiter / Kodiak Bear (Ursus arctos middendorffi) with mouth agape, native to Kodiak Island, Alaska

Matthias Breiter / Kodiak Bear (Ursus arctos middendorffi) four week old cub, native to Kodiak Island, Alaska

Matthias Breiter / Polar Bear (Ursus maritimus) male resting on ice, Hudson Bay, Manitoba, Canada

Matthias Breiter / Polar Bear (Ursus maritimus) male resting on ice, Hudson Bay, Manitoba, Canada

Matthias Breiter / Black Bear (Ursus americanus) in temperate rainforest, Tongass National Forest, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) yearling cub in temperate rainforest, Tongass National Forest, Alaska

Matthias Breiter / Black Bear (Ursus americanus) sleeping in tree in temperate rainforest, Anan Creek, Tongass National Forest, Alaska

Matthias Breiter / Black Bear (Ursus americanus) sleeping in tree in temperate rainforest, Anan Creek, Tongass National Forest, Alaska