Jen Guyton / Savage's thin-toed frog (Leptodactylus savagei) camouflaged, Costa Rica.

MYN / JP Lawrence / Savage's Thin-toed Frog (Leptodactylus savagei) Isla Colon, Panama. Meetyourneighbours.net project

MYN / JP Lawrence / Savage's Thin-toed Frog (Leptodactylus savagei) Isla Colon, Panama. Meetyourneighbours.net project

MYN / JP Lawrence / Unidentified metamorph frog (possibly Leptodactylus savagei) Isla Colon, Panama. Meetyourneighbours.net project

Piotr Naskrecki / Savage's Thin-toed Frog (Leptodactylus savagei), Carara National Park, Costa Rica

Roman Willi / Savage's thin-toed frog (Leptodactylus savagei) juvenile, portrait, Osa Peninsula, Costa Rica.

Donald M. Jones / Moose (Alces alces) female crossing highway, central Alaska

Steven Kazlowski / Northern lights (Aurora borealis) glowing brightly over trees along Steese Highway, Cleary Point, outside Fairbanks, Alaska

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

Suzi Eszterhas / Dall sheep (Ovis dalli) group on cliffs, Seward Highway, Alaska, USA. July.

Matthias Breiter / Chugach Mountains, Glen Highway, Alaska

Matthias Breiter / Chugach Mountains, Glen Highway, Alaska

Donald M. Jones / Moose (Alces alces) bull crossing highway, central Alaska

John Abbott / Panoramic of Alaska Range with Mt. McKinley taken from Parks Highway, Alaska, USA, July 2012.

Steven Kazlowski / Northern lights (Aurora borealis) glowing brightly over trees along Steese Highway, Cleary Point, outside Fairbanks, Alaska

Steven Kazlowski / Northern lights (Aurora borealis) glowing brightly over trees along Steese Highway, Cleary Point, outside Fairbanks, Alaska

Steven Kazlowski / Northern lights (Aurora borealis) glowing brightly over trees along Steese Highway, Cleary Point, outside Fairbanks, Alaska, July 2012.

Michael Quinton / Caribou (Rangifer tarandus) jumping over barrier onto highway during migration, Slana River, Alaska

Michael Quinton / Caribou (Rangifer tarandus) herd migrating across Tok Cut-Off highway, Alaska

Konstantin Mikhailov / Wrangell Mountains in Saint Elias National Park seen across Willow Lake surrounded by mixed spruce-birch forest, Richardson Highway, Alaska, USA, September 2009

Konstantin Mikhailov / Wrangell Mountains in Saint Elias National Park seen across Willow Lake surrounded by mixed spruce-birch forest, Richardson Highway, Alaska, USA, September 2009

Konstantin Mikhailov / Matanuska Glacier in the upper reaches of Matanuska River, Matanuska Glacier State Reservation Site, Glenn Highway, Alaska, USA, October 2009

Konstantin Mikhailov / View towards the Alaska Range across upland plateau, Denali Highway, Alaska, USA, September 2009

Konstantin Mikhailov / Water in upland plateau with tundra-like thickets of Birch and dwarf Willows, and thin forest of White spruce (Picea glauca) with Alaska Range in the distance, Denali Highway, Alaska, USA, September 2...

Konstantin Mikhailov / Upland plateau with tundra-like thickets of Polar birch and dwarf willows, Alaska Range in the distance, Denali Highway, Alaska, USA, September 2009

Konstantin Mikhailov / Nenana River with White spruce (Picea glauca) and Black spruce (Picea nigra) on the upland plateau of the Alaska Range, along the Denali Highway, Alaska, USA, September 2009

Konstantin Mikhailov / River flowing through Black spruce (Picea mariana) and White spruce (Picea glauca) forests, Dalton Highway south of Brooks Range and north off Coldfoot, Alaska, USA, September 2009

Konstantin Mikhailov / The most northern Spruce tree (Picea sp) on the Alalska pipe line, killed by ringing, Dalton Highway, Alaska, USA, September 2009

Konstantin Mikhailov / Dalton Highway running North from Atigun Pass over the Brooks Range, Alaska, USA, September 2009

Konstantin Mikhailov / Upland swampy plateau with Alaska Range in distance, Denali Highway, Alaska, USA, September 2009

Matthias Breiter / Black Bear (Ursus americanus) along Alaska Highway near Liard River Hot Springs Provincial Park, British Columbia, Canada

Matthias Breiter / Wood Bison (Bison bison athabascae) crossing Alaska Highway near Liard River Hot Springs Provincial Park wtih RV in the background, British Columbia, Canada

Matthias Breiter / Wood Bison (Bison bison athabascae) group crossing Alaska Highway near Liard River Hot Springs Provincial Park, British Columbia, Canada

Matthias Breiter / Wood Bison (Bison bison athabascae) along Alaska Highway near Liard River Hot Springs Provincial Park, British Columbia, Canada

Matthias Breiter / Morning fog near Swan Lake along the Alaska Highway, Yukon, Canada

Konstantin Mikhailov / Scenic Views of Alaska. First snow in the end of September, in the mid of the Glenn Highway (Road 1) following aross up-land from Glennalen to Palmer. Southern ALASKA, USA, September 2009

Konstantin Mikhailov / The northern taiga of Alaska (of Black Spruce, Picea nigra), Dalton Highway north of Coldfoot, ALASKA, USA, North America, September 2009

Konstantin Mikhailov / Famous Denali HW area, a view from the upland plateau down to the valley of Susitna River with lakes, spruces (White spruce and Black Spruce) and the Fir (Abies). The land of moose, caribou and willo...

Konstantin Mikhailov / The northern taiga of Alaska (of Black Spruce, Picea nigra), Dalton Highway, ALASKA, USA, North America, September 2009

Konstantin Mikhailov / Dalton Highway, famous Alaska Pipeline after crossing Brooks Range with back view to the south to Pump Station N4 (on the hill). Galbrath lake at right. The mountainous tundra of Alaska. North Americ...

Konstantin Mikhailov / Famous Denali HW area, typical landscape with rocks, dwarf birches and willows on upland plateau with a view to the ridges of Alaska Range from a south. Denali HighWay (Road 8) leading to Denali NP fr...

Konstantin Mikhailov / The northern taiga of Alaska (of Black Spruce) in early morning mist, the shore of the Yukon River near Dalton Highway, ALASKA, USA, North America, September 2009

Konstantin Mikhailov / Scenic Highways of Alaska. First snow in the end of September, on the Glenn Highway (Road 1) following aross up-land from Glennalen to Palmer. Southern ALASKA, USA, September 2009

Konstantin Mikhailov / Scenic views of Alaska. A view to Wrangell Mts. from the west, across Lake Willow surrounded by mixed spruce-birch taiga. Richardson HighWay (Road 4). ALASKA, USA, September 2009

Konstantin Mikhailov / Famous Denali HW area, a typical landscape with lakes, White spruce (Picea glauca) and dwarf birches on upland plateau of Alaska Range. The land of caribou, willow grouse and moose. Denali HighWay (R...

Konstantin Mikhailov / Scenic views of Alaska. A view to Wrangell Mts. from the west, across Lake Willow surrounded by mixed spruce-birch taiga. Richardson HighWay (Road 4). ALASKA, USA, September 2009

Konstantin Mikhailov / Dalton Highway, famous Alaska Pipeline just after crossing Yukon River. The northern depressed taiga of Alaska with Black spruce forest killed by bark beetle. North America, ALASKA, USA, September 2...

Konstantin Mikhailov / Scenic views of Alaska. A view to Wrangell Mts. from the west, across Lake Willow . Richardson HighWay (Road 4). ALASKA, USA, September 2009

Konstantin Mikhailov / Dalton Highway, famous Alaska Pipeline after crossing Brooks Range. The mountainous tundra of Alaska. North America, ALASKA, USA, September 2009

Konstantin Mikhailov / Dalton Highway, famous Alaska Pipeline before Brooks Range. The depressed taiga of Alaska with spruce. North America, ALASKA, USA, September 2009

Konstantin Mikhailov / Dalton Highway, famous Alaska Pipeline just after crossing Yukon River. The northern depressed taiga of Alaska with Black spruce forest killed by bark beetle. North America, ALASKA, USA, September 2...

Konstantin Mikhailov / Very early dawn in Alaska with a moon. A view over the valley of Susitna River across the depressed taiga with Black Spruce (Picea nigra) to the north, with Alaska Range in background. George Parks H...

Konstantin Mikhailov / Famous Denali HW area, a typical landscape with White spruce (Picea glauca) on upland plateau of Alaska Range. The land of caribou, willow grouse and moose. Denali HighWay (Road 8) leading to Denali...

Yva Momatiuk & John Eastcott / Willow Ptarmigan (Lagopus lagopus) hen, Dempster Highway, Yukon, Canada

Matthias Breiter / Alaska Moose (Alces alces gigas) calf trying to cross highway, Sutton, Alaska

Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in fall near the Alaska Highway, British Columbia, Canada

Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in fall near the Alaska Highway, British Columbia, Canada

Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in fall near the Alaska Highway, British Columbia, Canada

Yva Momatiuk & John Eastcott / Permafrost cooling device along Alaska Highway helps to stabilize slopes of roadway and prevents frost heaves, Yukon, Canada

Yva Momatiuk & John Eastcott / Cumulus clouds above the Alaska Highway, Yukon, Canada

Yva Momatiuk & John Eastcott / Cumulus clouds above the Alaska Highway, Yukon, Canada

Theo Allofs / Autumn colors on hills along the Top of the World Highway between Dawson City in the Yukon Territory, Canada and Tok, Alaska

Theo Allofs / Autumn colors on hills along the Top of the World Highway between Dawson City, Yukon, and Tok, Alaska

Theo Allofs / Recreational vehicle driving on the Top of the World Highway between Dawson City, Yukon, and Tok, Alaska

Matthias Breiter / Hoar frost covering spruce forest on Radio Hill, Alaska

Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) with golden leaves and highway, and cumulus clouds in autumn evening, Alaska Highway, Yukon Territory, Canada

George McCarthy / Female Moose (Alces alces) feeding submerged in water. Flies and mosquitoes hover in the air waiting for her to surface, Alaskan Highway, Alaska, USA

George McCarthy / Female Moose (Alces alces) emerging from water after feeding, alongside the Alaskan Highway, Alaska, USA

George McCarthy / Hoary Marmot (Marmota caligata) by the side of the Alaskan Highway, Alaska, USA

George McCarthy / Female Moose (Alces alces) in long grass, Alaskan Highway, Alaska, USA

George McCarthy / Female Moose (Alces alces) feeding in roadside water pools, Alaskan Highway, Alaska, USA

George McCarthy / Female Moose (Alces alces) with her two calves, Alaskan Highway, USA

George McCarthy / Moose cow (Alces alces) feeding on vegetation in roadside pool, Alaskan Highway, Alaska, USA

George McCarthy / Cow Moose (Alces alces) with mosquitos and flies covering her back, Alaskan Highway, USA

Yva Momatiuk & John Eastcott / Taiga becomes tundra, tree line in snow, near polar circle, Finger Mountain region, early spring, near Dalton Highway, Alaska

Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) tree trunks, in snow, near parks highway, early spring, Alaska

Yva Momatiuk & John Eastcott / Boreal forest below Talkeetna Mountains in snow, near Parks Highway, early spring, Alaska

Matthias Breiter / Aurora borealis over pipeline, Haul Road, Dalton Highway, Alaska

Yva Momatiuk & John Eastcott / Red Fox (Vulpes vulpes) killed by truck, Dalton Highway, North Slope, Alaska

Konrad Wothe / Alaska Moose (Alces alces gigas) crossing highway, Alaska Moose Pass, Chugach National Forest, Alaska

Peter Mather / Northern lights over trucks on Dalton Highway which is used to service oil fields in Prudhoe Bay, Alaska

Peter Mather / Northern lights over Alyeska Pipeline, which carries oil from oil fields in Prudhoe Bay near the Arctic National Wildlife Refuge, down to Valdez, Alaska

Peter Mather / Caribou (Rangifer tarandus) pair, from the central arctic herd, near Dalton Highway, near Arctic National Wildlife Refuge, Alaska

Matthias Breiter / Northern lights above lake, Glen Highway, Alaska

Matthias Breiter / Alaska pipeline along Richardson Highway, Alaska

Matthias Breiter / Alaska pipeline along Richardson Highway, Alaska

Matthias Breiter / Tundra in autumn, Denali Highway, Alaska

Matthias Breiter / Tundra and wetland in autumn, Denali Highway, Alaska

Matthias Breiter / Tundra in autumn, Denali Highway, Alaska

Peter Mather / Dall's Sheep (Ovis dalli) females licking salt off road, Alaska Highway, Kluane National Park, Yukon, Canada

Matthias Breiter / Black Bear (Ursus americanus) along Alaska Highway near Liard River Hot Springs Provincial Park, British Columbia, Canada

Matthias Breiter / Catamaran ferry of the Alaska Marine Highway arriving in Petersburg, Stikine-LeConte Wilderness, Alaska

Matthias Breiter / Unnamed waterfall along South Tongass Highway, Ketchikan, Alaska

Matthias Breiter / Unnamed waterfall along South Tongass Highway, Ketchikan, Alaska

Yva Momatiuk & John Eastcott / Arctic Ground Squirrel (Spermophilus parryii) standing on road, Dalton Highway, Alaska

Yva Momatiuk & John Eastcott / Arctic Ground Squirrel (Spermophilus parryii) standing on road, Dalton Highway, Alaska

Theo Allofs / Autumn colors on burned hills along the Top of the World Highway between Dawson City, Yukon, and Tok, Alaska

Yva Momatiuk & John Eastcott / Dwarf Birch (Betula nana) dwarf willow, lichens and berry bushes surround small rocky ridge containing good fox denning sites near Dalton Highway, autumn afternoon, North Slope, arctic Alaska

Yva Momatiuk & John Eastcott / Dwarf Birch (Betula nana) dwarf willow, lichens and berry bushes surround small rocky ridge containing good fox denning sites near Dalton Highway, autumn afternoon, North Slope, arctic Alaska

Matthias Breiter / Aurora borealis over pipeline, Haul Road, Dalton Highway, Alaska

Yva Momatiuk & John Eastcott / Snow covered mountain near Brooks Range, Dalton Highway, early spring, Alaska

Yva Momatiuk & John Eastcott / Bridal Veil Falls, Richardson highway near Seward, Alaska