Patricio Robles Gil / St. Elias Mountains, Kluane National Park, Canada

Patricio Robles Gil / Glacier, St. Elias Mountain, Kluane National Park, Canada

Jim Brandenburg / Aerial view of converging glacier, Ellesmere Island, Nunavut, Canada

Tim Fitzharris / Winter forest, British Columbia, Canada

Jim Brandenburg / Alluvial fan at mouth of glacial stream, Canadian Rocky Mountains, Alberta, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale, group swimming along ice edge, Lancaster Sound, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) group of males, Baffin Island, Nunavut, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale, hundreds swim and molt in freshwater shallows, Northwest Territories, Canada

Kevin Schafer / Coniferous forest and Cerulean Lake, Mount Assiniboine Provincial Park, British Columbia, Canada

Matthias Breiter / Mountains above Coral Creek and Cline River, Jasper National Park, Alberta, Canada

Matthias Breiter / Cline River showing heavy siltation and braiding, Jasper National Park, Alberta, Canada

Yva Momatiuk & John Eastcott / Northern Gannet (Morus bassanus) nesting colony, Cape St. Mary's Ecological Reserve, Newfoundland, Canada

Jan Vermeer / Harp Seal (Phoca groenlandicus) group on ice field, Magdalen Islands, Gulf of Saint Lawrence, Canada

Jim Brandenburg / Polar Bear (Ursus maritimus) hauling out onto iceberg, Canada

Theo Allofs / View onto Yukon River near Dawson City from Midnight Dome, Yukon, Canada

Ingo Arndt / Aerial view of the Horseshoe or Canadian Falls at Niagara Falls, Ontario, Canada

Flip Nicklin / Gray Whale (Eschrichtius robustus) surfacing off of Vancouver Island leaving a silty wake, Canada

Flip Nicklin / Gray Whale (Eschrichtius robustus) surfacing near private boat with people watching near Tofino, Vancouver Island, Canada

Flip Nicklin / Gray Whale (Eschrichtius robustus) trio surfacing near alluvial fan off of Vancouver Island, Canada

Flip Nicklin / Gray Whale (Eschrichtius robustus) surfacing off of Vancouver Island leaving silty wake, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale pod molt in freshwater shallows, Northwest Territory, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale pod molt in freshwater shallows, Northwest Territory, Canada

Flip Nicklin / Polar Bear (Ursus maritimus) swimming in open water, Canada

Flip Nicklin / Bowhead Whale (Balaena mysticetus) in open water, Isabella Bay, Baffin Island, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale pod swimming along shore where researcher records and photographs, Baffin Island, Canada

Suzi Eszterhas / Polar Bear (Ursus maritimus) tracks coming onto edge of sea ice, vulnerable, Wapusk National Park, Manitoba, Canada

Suzi Eszterhas / Polar Bear (Ursus maritimus) tracks coming onto edge of sea ice, vulnerable, Wapusk National Park, Manitoba, Canada

Suzi Eszterhas / Spruce (Picea sp) trees and lakeshore make up Polar Bear (Ursus maritimus) denning habitat of the Western Hudson Bay population, Wapusk National Park, Manitoba, Canada

Suzi Eszterhas / Hudson Bay in spring showing ice break-up, Churchill, Manitoba, Canada

Suzi Eszterhas / Hudson Bay in spring showing ice break-up, Churchill, Manitoba, Canada

Suzi Eszterhas / Hudson Bay in spring showing ice edge, Churchill, Manitoba, Canada

Suzi Eszterhas / Polar Bear (Ursus maritimus) denning habitat of the Western Hudson Bay population, vulnerable, Wapusk National Park, Manitoba, Canada

Patricio Robles Gil / St. Elias Mountains showing bowl shaped glacial cirques and valley glaciers, Kluane National Park, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale, hundreds swim and molt in freshwater shallows, Northwest Territories, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) group swimming and molting in shallow inlet, Northwest Territories, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial view of a group of males, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial view of male group, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) pod aerial, Baffin Island, Nunavut, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) group, aerial view, Northwest Territories, Canada

Patricio Robles Gil / St. Elias Mountains, Kluane National Park, northern Canadian Rocky Mountains, Canada

Patricio Robles Gil / Peak in the St. Elias Mountain, Kluane National Park, Canada

Sumio Harada / Engelmann Spruce (Picea engelmannii) forest of snow-covered trees, Banff National Park, British Columbia, Canada

Sumio Harada / Aerial view of snow-covered landscape, Banff National Park, British Columbia, Canada

Gerry Ellis / Spruce and deciduous trees advancing into former Beaver pond, display of wetlands succession, Algonquin Provincial Park, Ontario, Canada

Konrad Wothe / Aerial view of frozen tundra around Churchill, Canada

Konrad Wothe / Icebreaker in arctic, Canada

Jim Brandenburg / Aerial view of glacier and snow covered mountains, Ellesmere Island, Nunavut, Canada

Gerry Ellis / Folding and uplift along Laurentian Divide, St Lawrence Seaway, Quebec, Canada

Jim Brandenburg / Pressure ridges and lead in Arctic Ocean, Canada

Jim Brandenburg / Aerial view of fjord, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / High arctic tundra, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Mountain on the east coast of Ellesmere Island near Nares Strait with Greenland on the horizon, Northwest Territories, Canada

Jim Brandenburg / Converging glacier and snow covered mountain, Ellesmere Island, Nunavut, Canada

Flip Nicklin / Polar Bear (Ursus maritimus) on ice field, Canada

Jim Brandenburg / Polar Bear (Ursus maritimus) running across melting icy landscape, Ellesmere Island, Nunavut, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) harassing Bowhead Whale (Balaena mysticetus), Lancaster Sound, Canada

Jim Brandenburg / Aerial view of Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Mountain range, Ellesmere Island, Nunavut, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) cows with calves, Borden Peninsula, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale, group, Lancaster Sound, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial view of five males swimming near water surface, Baffin Island, Canada

Flip Nicklin / Bottlenose Whale (Hyperoodon ampullatus) group surfacing, Nova Scotia, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial view of five males swimming near water surface, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial of pod, Lancaster Sound, Canada

Flip Nicklin / Narwhal (Monodon monoceros) swimming near water's surface, Baffin Island, Canada

Jim Brandenburg / Blue ice pools in arctic icefield, Ellesmere Island, Nunavut, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) group swimming and molting, Cunningham Inlet shallows, Northwest Territories, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) hundreds swim and molt in freshwater shallows, Northwest Territories, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) cow and calf migrating through spring ice, Northwest Territories, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) cows and calves in shallow estuary, Somerset Island, Nunavut, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale, group swimming and molting in freshwater shallows, Somerset Island, Nunavut, Canada

Flip Nicklin / Bottlenose Whale (Hyperoodon ampullatus) a curious calf surfaces with family group, Nova Scotia, Canada

Flip Nicklin / Bottlenose Whale (Hyperoodon ampullatus) pair surfacing in unison, Nova Scotia, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale, group in ice break, Lancaster Sound, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) group tusking, Baffin Island, Nunavut, Canada

Patricio Robles Gil / Caribou (Rangifer tarandus) aerial view of the Bluenose herd migrating, Northwest Territories, Canada

Jim Brandenburg / Aerial view of glacier and snow covered mountains, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Aerial view of tundra ridged by glacial movement, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Aerial view of snow covered mountain, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Snow covered mountain, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Aerial view of mountains and icefield in high Arctic, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Glacier runoff in valley carved by retreating glacier, Canada

Jim Brandenburg / Aerial view of tundra ridged by glacial movement, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Aerial view of snow covered mountains, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Aerial view of mountains and icefield in high Arctic, Ellesmere Island, Nunavut, Canada

Flip Nicklin / Bottlenose Whale (Hyperoodon ampullatus) group, Nova Scotia, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) whale group surfacing among ice floes, Lancaster Sound, Canada

Flip Nicklin / Bowhead Whale (Balaena mysticetus) sex play, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial of six males swimming near water surface, Baffin Island, Canada

Jim Brandenburg / Snow covered mountains, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Ice floes surrounding islands and snow-covered peaks, Ellesmere Island, Nunavut, Canada