Nick Garbutt / RF - Red fox (Vulpes vulpes) foraging in snow covered valley. Hayden Valley, Yellowstone National Park, USA. February 2019. (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Polar bear (Ursus maritimus) male walking through snow covered landscape, mountains in background. Svalbard, Norway, April (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Reindeer (Rangifer tarandus) walking up slope in snow. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

SCOTLAND: The Big Picture / Lone Scot's pine tree (Pinus sylvestris) and star trails with the north star, Abernethy forest, Cairngorms National Park, Scotland, UK.

Wim van den Heever / Oryx (Oryx gazella) lone animal standing on the top of a red dune, Sossuvlei, Namibia.

Doug Perrine / Humpback whale (Megaptera novaeangliae) lone female playing, blowing bubble stream, Kona, Hawaii, USA.

Erlend Haarberg / Red fox (Vulpes vulpes) in snow, Varanger Peninsula, Norway.

Floris van Breugel / A lone palm tree at twilight off the coast of American Samoa. January 2012.

Graham Eaton / A lone surfer silhouetted whilst walking into the sea, Hells Mouth, Wales, October 2012

David Welling / Lone Pine Peak and Granite rock formations covered with snow at winter sunrise, Alabama Hills, Eastern Sierras, California, USA NOT AVAILABLE FOR CARDS OR CALENDARS.

Pascal Tordeux / Lone Maple (Acer) in a field against cumulo-nimbus and mammatus clouds. Picardy, France, May.

Pascal Tordeux / Lone tree in a barley field. Picardy, France.

Pascal Tordeux / Lone Walnut (Juglans) tree in a field of barley. Picardy, France.

Guy Edwardes / 2020VISION / Winter sunset over the Somerset Levels from Walton Hill on a misty evening with snow on the ground. View includes Butleigh Moor, Somerton Moor, Street Moor, Low Ham Moor, Walton Moor, Pitney Moor, Hui...

Andrew Parkinson / Red deer (Cervus elaphus) stag portrait, Leicestershire, UK, October.

Alex Mustard / A lone Caribbean reef shark (Carcharhinus perezi) cruises over sand ripples. Walkers Cay, Northern Bahama Islands, Republic of Bahamas.

Jerry Monkman / Lone hiker at sunrise on the Bold Coast trail in Cutler, Maine, USA, June 2009. Model released

Jack Dykinga / Lone Ponderosa pine tree {Pinus ponderosa} in front of canyon walls showing drip mark fractures, Long Canyon, Grand Staircase-Escalante National Monumnet, Utah, USA

Jack Dykinga / Silhouette of lone Ponderosa pine on a sandstone spire at dusk, with crescent moon, Zion National Park, Utah, USA

Jeff Vanuga / Lone Star Geyser erupting in Lone Star Geysyer Basin at night, Yellowstone National Park, Wyoming, USA, October 2007

Adam Burton / A lone photographer captures the rugged Cornish coastline, Land's End, Cornwall, UK

Jack Dykinga / Ray of light falling on a lone Acacia tree in the Masai Mara, Kenya

Sue Flood / Lone polar bear (Ursus maritimus) walking on ice in the Arctic Ocean, July

Doug Perrine / Wild sociable Bottlenose dolphin above coral reef {Tursiops truncatus} Belize - (Non-ex).

Doug Perrine / Bottlenose dolphin face portrait {Tursiops truncatus} Caribbean - Spot a lone (Non-ex).

Suzi Eszterhas / Adelie Penguin (Pygoscelis adeliae) standing on iceberg, Paulet Island, Antarctica

Suzi Eszterhas / Adelie Penguin (Pygoscelis adeliae) on edge of iceberg, Paulet Island, Antarctica

Suzi Eszterhas / Polar Bear (Ursus maritimus) lone yearling on shore, Churchill, Manitoba, Canada

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) tail slapping at sunrise, Lahaina, Maui, Hawaii

Chase Dekker / Brown Bear (Ursus arctos) in river, Katmai National Park, Alaska

Yva Momatiuk & John Eastcott / Ice climber scaling Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Marion Vollborn/ BIA / Bald Eagle (Haliaeetus leucocephalus) flying, Alaska

Matthias Breiter / Bald Eagle (Haliaeetus leucocephalus) on iceberg, LeConte Bay, Tongass National Forest, Alaska

Matthias Breiter / Polar Bear (Ursus maritimus) male at edge of sea ice, Churchill, Manitoba, Canada

Yva Momatiuk & John Eastcott / Climber climbing rock, Indian Creek, Utah

Gerry Ellis / Orangutan (Pongo pygmaeus) sub-adult male in trees in haze caused by forest clearing, West Kalimantan, Borneo, Indonesia. October, 2015

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) migrating upstream, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Luciano Candisani / Cushioned Star (Oreaster reticulatus), Gipoia Island, Ilha Grande, Brazil

Vincent Grafhorst / Meerkat (Suricata suricatta) sentinel on termite mound, Makgadikgadi, Botswana

Colin Monteath / Climber near Pioneer Hut with Douglas Peak and Fox Glacier, Westland Tai Poutini National Park, New Zealand

Jim Brandenburg / Thickspike Gayfeather (Liatris pycnostachya) flowering on tallgrass prairie, Crow-Hassan Park Reserve, Minnesota

Colin Monteath / Pine tree (Pinus sp), Decanter Bay, Canterbury, New Zealand

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Lone hiker walking on colorful sandstone strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Claus Meyer / Tiger-striped Leaf Frog (Phyllomedusa tomopterna) waving, Amazon rainforest, Brazil

Gerry Ellis / Sunrise through thermal fog and lone tree, Snake River, Grand Teton National Park, Wyoming

Shin Yoshino / Koala (Phascolarctos cinereus) group sitting on branch, Lone Pine Koala Sanctuary, Brisbane, Australia