Donald M. Jones / Moose (Alces alces) bull in fall at tundra pond, Mount Denali, Denali National Park, Alaska

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 / Glacial kettle pond with Alaska Range and Mount McKinley in distance, Denali National Park and Preserve, Alaska

John Shaw / Red phalarope (Phalaropus fulicarius), swimming on a tundra pond. Spitsbergen, Svalbard, Norway. June.

Gerrit Vyn / Spectacled Eider (Somateria fischeri) male standing alert on the bank of a tundra pond, Yukon Delta National Wildlife Refuge, Alaska, USA, June.

Gerrit Vyn / Black scoters (Melanitta nigra) male and female mated pair on a tundra pond. Seward Peninsula, Alaska USA June

Gerrit Vyn / Coastal tundra pond, Yukon Delta National Wildlife Refuge, Alaska, USA September

Gerrit Vyn / Yellow-billed Loon (Gavia adamsii) in breeding plumage wing stretching on a tundra pond, Arctic Coastal Plain, Alaska, USA June

Gerrit Vyn / Yellow-billed Loon (Gavia adamsii) in breeding plumage wing stretching on a tundra pond, Arctic Coastal Plain, Alaska, USA June

Yva Momatiuk & John Eastcott / Glacial pond on tundra with willows, Alaska

Yva Momatiuk & John Eastcott / Tundra pond under overcast skies, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Tundra pond, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Tundra pond, Denali National Park, Alaska

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

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

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 / Alaska Moose (Alces alces gigas) sub-adult bull with antlers in velvet feeding in tundra pond, Denali National Park, Alaska

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

Kevin Schafer / Tundra pond, Edgeoya (Edge Island) Svalbard, Norway, August 2010

Kevin Schafer / Tundra pond with mountain in the distance, Edgeoya (Edge Island) Svalbard, Norway, August 2010

Gerrit Vyn / Long-tailed Duck (Clangula hyemalis) male in breeding plumage on a tundra pond. Barrow, Alaska, USA, June.

Bryan and Cherry Alexander / Snow covered tundra with Mount Herodier and Bylot Island shrouded in mist over Pond Inlet. Nunavut, Canada, 1999.

Gerrit Vyn / Adult female Black Scoter (Melanitta nigra) on a tundra pond. Seward Peninsula, Alaska, USA, June.

Gerrit Vyn / Adult male Black Scoter (Melanitta nigra) on a tundra pond. Seward Peninsula, Alaska, USA, June.

Gerrit Vyn / Male Greater Scaup (Aythya marila) on a tundra pond. Seward Peninsula, Alaska, USA, June.

Jim Brandenburg / Tundra and pond, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Tundra kettle pond reflecting cumulus clouds, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Tundra kettle ponds reflecting cumulus clouds, Denali National Park, Alaska

Roy Mangersnes / Semipalmated sandpiper (Calidris pusilla) bathing in pond off Point Barrow, National Petroleum Reserves, Arctic Alaska, USA. June

Roy Mangersnes / Semipalmated sandpiper (Calidris pusilla) landing at a pond off Point Barrow, National Petroleum Reserves, Arctic Alaska USA. June

Roy Mangersnes / Grey Phalarope (Phalaropus fulicarius) two females fighting over a male at nesting pond on arctic tundra off Point Barrow, National Petroleum Reserves, Arctic Alaska, USA. June

Roy Mangersnes / Dunlin (Calidris alpina) bathing in a pond off Point Barrow, National Petroleum Reserves, Arctic Alaska, USA. June

Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) bull drinking in pond in tundra during fall rut, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) orphaned calf feeding on pond vegetation in fall tundra, Denali National Park, Alaska

Roy Mangersnes / Spectacled Eider (Somateria fischeri) pair on breeding pond in arctic tundra, Barrow, Alaska, USA. June

Roy Mangersnes / Spectacled Eider (Somateria fischeri) pair on breeding pond in arctic tundra, Barrow, Alaska, USA. June

Roy Mangersnes / Sabine's Gull (Xema sabini) sitting in a pond, stretching, on arctic tundra of Barrow, Alaska, USA. June

Roy Mangersnes / Grey Phalarope (Phalaropus fulicarius) female catching food, mosquito larva, in a pond on the arctic tundra of Barrow, Alaska, USA. June

Roy Mangersnes / Grey Phalarope (Phalaropus fulicarius) female in a pond on the arctic tundra of Barrow, Alaska, USA. June

Roy Mangersnes / Sabine's Gull (Xema sabini) sitting in a pond on the arctic tundra of Barrow, Alaska, USA. June

Roy Mangersnes / Sabine's Gull (Xema sabini) sitting in a pond on the arctic tundra of Barrow, Alaska, USA. June

Roy Mangersnes / Spectacled Eider (Somateria fischeri) male on breeding pond in arctic tundra, Barrow, Alaska, USA. June

Yva Momatiuk & John Eastcott / Mount Galen, colorful tundra, cumulus clouds and glacial kettle pond slowly disappearing in surrounding vegetation, in autumn, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Mountains in first autumn snow and big cumulus clouds in blue sky reflecting in tundra pond, afternoon, Brooks Range, arctic Alaska

Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) a semi-aquatic rodent swimming branches across calm pond behind beaver dam, fall evening, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) bull, largest herbivore with antlers in North America, alert during rutting season, standing in shallow glacial kettle pond in colorful fall tundra, Denali National Pa...

Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) bull, largest herbivore with antlers in North America, alert during rutting season, drinking from shallow glacial kettle pond in colorful fall tundra, Denali National...

Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) bull, largest herbivore with antlers in North America, alert during rutting season, standing in shallow glacial kettle pond in colorful fall tundra, Denali National Pa...

Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) cow, largest herbivore in North America, feeding on aquatic vegetation with important salts in shallow glacial kettle pond in colorful fall tundra, Denali National Par...

Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) cow, largest herbivore with antlers in North America, alert during rutting season, standing in shallow glacial kettle pond in colorful fall tundra, Denali National Par...

Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) bull, largest herbivore with antlers in North America, alert during rutting season, standing in shallow glacial kettle pond in colorful fall tundra, Denali National Pa...

Yva Momatiuk & John Eastcott / Blue glacier receding and small tarn or pond, on green and golden tundra slope, with grasses, lichen, moss, rocks and erratic boulders, fall morning, Salversen Range, Smaaland Cove, South Georgia Isla...

Philippe Clement / American Beaver's lodge (Castor canadensis) in pond in tundra habitat, Denali NP, Alaska, USA.

Philippe Clement / Kettle pond and erratic boulder (glacial features) on tundra, Denali NP, Alaska, USA

Yva Momatiuk & John Eastcott / Kettle pond on autumn tundra, Richardson Mountain, Yukon, Canada

Matthias Breiter / Tundra Swan (Cygnus columbianus) on frozen pond, Alaska Range, Tok, Alaska

Thomas Mangelsen / Mt Denali reflected in tundra pond, Denali National Park and Preserve, Alaska

Thomas Mangelsen / Mt Denali and tundra pond, Denali National Park and Preserve, Alaska

Matthias Breiter / Mt. Denali reflected in tundra pond, Denali National Park and Preserve, Alaska

Tui De Roy / Caribou (Rangifer tarandus) antler on tundra bog, Edgeoya, Svalbard Archipelago, Norway

Michael Quinton / Tundra Shrew (Sorex tundrensis) eating another shrew, boreal pond habitat, Alaska

Jim Brandenburg / Tundra with ponds and the Alaska Range, Lake Clark National Park and Preserve, Alaska

Mark Raycroft / Moose (Alces alces) bull grazing near pond in tundra, North America

Tim Fitzharris / Pond and Ogilvie Mountains, Tombstone Territorial Park, Yukon, Canada

Jasper Doest / Arctic tundra with shallow pond and mountains, Adventdalen, Svalbard, Norway

Kevin Schafer / Mountains and tundra, South Georgia Island

Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) ponds created by the rodents building dams and raising levels of existing glacial kettle ponds, in colorful autumn tundra, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) a semi-aquatic rodent swimming across tundra pond behind beaver dam, with colorful reflections of fall tundra and vegetation on water ripples created by its passage...

Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) juvenile swimming in tundra pond behind beaver dam, surrounded by brilliant reflections of fall trees and grasses, evening, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Alaska Moose (Alces alces gigas) bull, largest herbivore with antlers in North America, alert during rutting season, standing in shallow glacial kettle pond in colorful fall tundra, Denali National Pa...

Gerry Ellis / Sadlerochit Mountains reflected in tussock tundra pond in summer, Sunset Pass, Arctic National Wildlife Refuge, Alaska

Gerry Ellis / Sadlerochit Mountains reflected in summer tussock tundra pond, Sunset Pass, Arctic National Wildlife Refuge, Alaska

Frederique Olivier / Tourist ship passing by and leaving Pond inlet, Qikiqtaaluk Region, Nunavut, Canada, September.

TJ Rich / Bewick's swan (Cygnus columbianus bewickii) preening, WWT Slimbridge, Gloucestershire, England, UK. January.

Tim Fitzharris / Tundra in autumn, Ogilvie Mountains, Yukon, Canada

Bryan and Cherry Alexander / Sasha Serotetto, a Nenets reindeer herder, sets a fishing net on a tundra pond. Yamal. Siberia. Russia. 1993.

John Shaw / Pacific loons (Gavia pacifica) on tundra pond with chick, Nome, Alaska, USA, July.

John Shaw / Paficic loon (Gavia pacifica) on tundra pond, Nome, Alaska, USA, July.