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Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

An adult thick-billed murre, Uria lomvia, in flight on Saint George Island, Pribilof Islands, Bering Sea, Alaska.

Adult rock sandpiper, Calidris ptilocnemis on Saint Mathew Island, a remote island in the Bering Sea, Alaska.

Adult rock sandpipers, Calidris ptilocnemis on Saint Mathew Island, a remote island in the Bering Sea, Alaska.

Adult dungeness crab, Metacarcinus magister, Tanaga Bay, Tanaga Island in the Aleutian Archipelago, Alaska.

Adult dungeness crab, Metacarcinus magister, Tanaga Bay, Tanaga Island in the Aleutian Archipelago, Alaska.

Adult dungeness crab, Metacarcinus magister, Tanaga Bay, Tanaga Island in the Aleutian Archipelago, Alaska.

Adult Insular vole, Microtus abbreviatus, endemic to Saint Mathew Island, a remote island in the Bering Sea, Alaska.

Woolly cranesbill, geranium erianthum, flowering in Dutch Harbor, Amaknak Island in Unalaska, Alaska.

Adult Insular vole, Microtus abbreviatus, endemic to Saint Mathew Island, a remote island in the Bering Sea, Alaska.

Seabeach Groundsel, Senecio pseudoarnica, flowering in Dutch Harbor, Amaknak Island in Unalaska, Alaska.

Larkspurleaf Monkshood, Aconitum delphinilfolium, flowers in Dutch Harbor, Amaknak Island in Unalaska, Alaska.

A huge flock of short-tailed shearwaters, Ardenna tenuirostris, in the Baby Islands, Bering Sea, Alaska.

A huge flock of short-tailed shearwaters, Ardenna tenuirostris, in the Baby Islands, Bering Sea, Alaska.

A huge flock of short-tailed shearwaters, Ardenna tenuirostris, in the Baby Islands, Bering Sea, Alaska.

Nesting cliffs of common murre, Uria aalge, and thick-billed murre, Uria lomvia, in the Aleutian Islands, Alaska.

Nesting cliffs of common murre, Uria aalge, and thick-billed murre, Uria lomvia, in the Aleutian Islands, Alaska.

A juvenile glaucous gull, Larus hyperboreus, on rafting kelp in the Baby Islands, Bering Sea, Alaska.

Nesting cliffs of common murre, Uria aalge, and thick-billed murre, Uria lomvia, in the Aleutian Islands, Alaska.

The Baby Islands, located about 1.2 miles northeast of Unalga Island in the Aleutian Islands of southwestern Alaska.

The Baby Islands, located about 1.2 miles northeast of Unalga Island in the Aleutian Islands of southwestern Alaska.

Wrecked and grounded B-24 Liberator bomber which ran out of fuel during WWII, Bechevin Bay, Atka Island, Alaska.

Detail from grounded B-24 Liberator bomber which ran out of fuel during WWII, Bechevin Bay, Atka Island, Alaska.

Detail from grounded B-24 Liberator bomber which ran out of fuel during WWII, Bechevin Bay, Atka Island, Alaska.

Gale force winds buffet the National Geographic Resolution in Tanaga Bay, Tanaga Island, Aleutian Islands, Alaska.

Arctic ground squirrel (Parka squirrel) (Citellus parryi), Hatcher Pass, Alaska, United States of America, North America

Long line fishing boat in Cross Sound with the Fairweather Mountain Range as backdrop, Southeast Alaska, United States of America, North America

Adult American black bear (Ursus americanus) near Mendenhall Glacier, Southeast Alaska, United States of America, North America

A close up view of Lamplugh Glacier in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Leaping pink salmon (Oncorhynchus gorbuscha) gathering to spawn at Lake Eva on Chichagof Island, Alaska, United States of America, North America

Views from the fishing town of Petersburg on Mitkof Island, Southeast Alaska, Pacific Ocean, United States of America, North America

Harbor seal (Phoca vitulina) hauled out on ice calved from South Sawyer Glacier, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations near a feeding sea otter in Southeast Alaska, United States of America, North America

Bald wagle (Haliaeetus leucocephalus) portrait, Alaska Raptor Rehabilitation Center, Sitka, Baranof Island, Alaska, United States of America, North America

Grizzly bear (Ursus arctos horribilis) (Coastal brown bear) eating a salmon, Katmai National Park and Preserve, Alaska, United States of America, North America

Mated bald eagle (Haliaeetus leucocephalus) pair on nest near the Brooks River, Katmai National Park, Alaska, United States of America

Hiker illuminated by a beam of sunlight after snowfall in the Denali National Park, Alaska, United States of America, North America

Sea otters (Enhyrda lutris), endangered species, and Mount Edgecumbe, extinct volcano, Sitka Sound, Sitka, Southeast Alaska, United States of America, North America

Kayak expedition preparations, Tracy Arm Fjord, clearing mist, icebergs and cascades, near South Sawyer Glacier, Alaska, United States of America, North America

Ice pack and blue ice face of South Sawyer Glacier, mountain backdrop, Stikine Icefield, Tracy Arm Fjord, Alaska, United States of America, North America

Adult humpback whales (Megaptera novaeangliae), surfacing in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Tufted puffin (Fratercula cirrhata) taking flight at South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

An adult common murre (Uria aalge), taking flight at St. Lazaria Island, Sitka Sound, Southeast Alaska, United States of America, North America

Adult bull Steller sea lion (Eumetopias jubatus), catching salmon at the Solomon Gulch Hatchery, Valdez, Alaska, United States of America, North America

Adult mountain goat, Oreamnos americanus, at South Sawyer Glacier in Tracy Arm, Southeast Alaska, USA.

A waterfall near Sawyer Glacier in Tracy Arm-Fords Terror Wilderness, Southeast Alaska, United States of America.

Adult pink salmon, Oncorhynchus gorbuscha, spawning in Fox Creek, Chichagof Island,, Southeast Alaska, USA.

Retreating tidewater South Sawyer Glacier meets the rock, Tracy Arm, Southeast Alaska, United States of America, North America

The face of glacier calving off on the South Sawyer Glacier, Tracy Arm, Southeast Alaska, United States of America, North America

Detail of ice calved from the Leconte Glacier but stranded on a terminal moraine, Petersburg, Southeast Alaska, United States of America, North America

Totem poles in Freedom Park, just outside the city of Sitka, Southeast Alaska, United States of America, North America

Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

Great Sitkin Island, the site of a fuel depot during World War II called Sand Bay Naval Station, Andreanof Islands, Alaska.

Unalaska Paintbrush, Castilleja unalasschcensis, flowering in Dutch Harbor, Amaknak Island in Unalaska, Alaska.

Seabeach Groundsel, Senecio pseudoarnica, flowering in Dutch Harbor, Amaknak Island in Unalaska, Alaska.

Larkspurleaf Monkshood, Aconitum delphinilfolium, flowers in Dutch Harbor, Amaknak Island in Unalaska, Alaska.

Larkspurleaf Monkshood, Aconitum delphinilfolium, flowers in Dutch Harbor, Amaknak Island in Unalaska, Alaska.

A huge flock of short-tailed shearwaters, Ardenna tenuirostris, in the Baby Islands, Bering Sea, Alaska.

A huge flock of short-tailed shearwaters, Ardenna tenuirostris, in the Baby Islands, Bering Sea, Alaska.

Mixed flock of common murre, Uria aalge, and thick-billed murre, Uria lomvia, in flight in the Aleutian Islands, Alaska.

Detail from grounded B-24 Liberator bomber which ran out of fuel during WWII, Bechevin Bay, Atka Island, Alaska.

Detail from grounded B-24 Liberator bomber which ran out of fuel during WWII, Bechevin Bay, Atka Island, Alaska.

Gale force winds buffet the National Geographic Resolution in Tanaga Bay, Tanaga Island, Aleutian Islands, Alaska.

Gale force winds buffet the National Geographic Resolution in Tanaga Bay, Tanaga Island, Aleutian Islands, Alaska.

Gale force winds buffet the National Geographic Resolution in Tanaga Bay, Tanaga Island, Aleutian Islands, Alaska.