David Noton / The road to Ojo de Perdiz, high on the altiplano, Bolivia, December 2009

David Noton / Woman and man with livestock walking along path, Isla del Sol, Lake Titicaca, Bolivia, December 2009

Jeff Wilson / Aerial view of K2 and glaciated valley of Concordia, Karakoram Mountains, Himalayas, Pakistan. From Pakistani military helicopter for BBC series Planet Earth April 2005

Aflo / Y-6504 Cirrus clouds in blue sky above mountain range, North America

Alan Watson / Montane rainforest canopy and clouds at 1,200 metres, Ranomafana National Park, Madagascar January 2009

Mark Bowler / Aerial view of cloud forest cleared for pasture near to populations of Yellow-tailed woolly monkeys, Alto Mayo, Amazonas, Peru, June 2008

Michael & Patricia Fogden / Blue Morpho (Morpho peleides) butterfly flying in cloud forest, Costa Rica

Michael & Patricia Fogden / Violet Sabre-wing (Campylopterus hemileucurus) immature hummingbird feeding and pollinating Coral Tree (Erythrina sp) flowers, cloud forest, Costa Rica

Michael & Patricia Fogden / Green Violet-ear (Colibri thalassinus) hummingbird feeding, pollinating epiphytic orchid flower, cloud forest ecosystem, Costa Rica

Michael & Patricia Fogden / Green Hermit (Phaethornis guy) hummingbird feeding on and pollinating Coral Tree (Erythrina sp) flowers, Monteverde Cloud Forest Reserve, Costa Rica

Michael & Patricia Fogden / Snowy-bellied Hummingbird (Amazilia edward) male flying near Firebush flowers (Hamelia patens) cloud forest, Costa Rica

Michael & Patricia Fogden / Purple-throated Mountain-gem (Lampornis calolaemus) hummingbird female feeding and pollinating flower of epiphytic Heath (Cavendishia melastomoides) cloud forest, Costa Rica

Michael & Patricia Fogden / Green Violet-ear (Colibri thalassinus) hummingbird feeding and pollinating flowers of epiphytic Heath (Cavendishia capitulata), Monteverde Cloud Forest Reserve, Costa Rica

Michael & Patricia Fogden / Green-crowned Brilliant (Heliodoxa jacula) hummingbird juvenile male feeding at and pollinating Ginger (Costus montanus) flowers, Monteverde Cloud Forest Reserve, Costa Rica

Michael & Patricia Fogden / Purple-throated Mountain-gem (Lampornis calolaemus) hummingbird female feeding at and pollinating epiphytic Orchid flowers (Elleanthus sp), Monteverde Cloud Forest Reserve, Costa Rica

Colin Monteath / Mountaineer enjoying the view of Mt Everest and the Himalayan Mountains at sunset from Gokyo Ri, Khumbu, Nepal

Konrad Wothe / Lemur Frog (Phyllomedusa lemur), Monteverde Cloud Forest Reserve, Costa Rica

Tim Fitzharris / Lily pads and cloud reflection, Granadier Range, Molas Pass, Weminuche Wilderness, Colorado

Michael & Patricia Fogden / Green Violet-ear (Colibri thalassinus) hummingbird feeding at and pollinating flowers of epiphytic Heath (Macleania insignis), Monteverde Cloud Forest Reserve, Costa Rica

Michael & Patricia Fogden / Violet Sabre-wing (Campylopterus hemileucurus) hummingbird male at Ginger (Costus montanus) flowers, Monteverde Cloud Forest Reserve, Costa Rica

Michael & Patricia Fogden / Green Violet-ear (Colibri thalassinus) hummingbird feeding on Heath (Cavendishia complectens) flowers, cloud forest, Costa Rica

Michael & Patricia Fogden / Coppery-headed Emerald (Elvira cupreiceps) hummingbird male feeding on and pollinating Shiney Maxillaria (Maxillaria fulgens) in cloud forest, Costa Rica

Michael & Patricia Fogden / Coppery-headed Emerald (Elvira cupreiceps) hummingbird male feeding on and pollinating Shiney Maxillaria (Maxillaria fulgens) in cloud forest, Costa Rica

Michael & Patricia Fogden / Children in the Monteverde Cloud Forest Reserve, Costa Rica

Colin Monteath / Mustagh Tower, center, and Masherbrum (K1) seen from Chongtar, Karakoram, Xinjiang, China

Tui De Roy / Tawny antpitta (Grallaria quitensis) found in high altitude Paramo grassland, Papallacta Valley, Tropical Andes, Papallacta Valley, Ecuador

Roland Seitre / High cloud forest in the Orjiamarillo reserve. Antioquia, Colombia, 2010.

Nick Garbutt / Mist and low cloud hanging over lowland Dipterocarp Rainforest, just after sunrise, Danum Valley, Sabah, Borneo, May 2011.

Chris Gomersall / 2020VISION / Large flock of Knot (Calidris canutus) and Bar-tailed godwit (Limosa lapponica) flying in a dense cloud whilst gathering on the foreshore at Snettisham RSPB reserve at high water, The Wash, Norfolk, E...

Chris Gomersall / 2020VISION / Large flock of Knot (Calidris canutus) and Bar-tailed godwit (Limosa lapponica) flying in a dense cloud whilst gathering on the foreshore at Snettisham RSPB reserve at high water, The Wash, Norfolk, E...

Chris Gomersall / 2020VISION / Large flock of Knot (Calidris canutus) and Bar-tailed godwit (Limosa lapponica) flying in a dense cloud whilst gathering on the foreshore at Snettisham RSPB reserve at high water, The Wash, Norfolk, E...

Chris Gomersall / 2020VISION / Large mixed flock of waders and wildfowl, including Knot (Calidris canutus), Bar-tailed godwit (Limosa lapponica), Common redshank (Tringa totanus), Dunlin (Calidris alpina), Oystercatcher (Haematopus...

Chris Gomersall / 2020VISION / Large flock of Knot (Calidris canutus) and Bar-tailed godwit (Limosa lapponica) flying in a dense cloud whilst gathering on the foreshore at Snettisham RSPB reserve at high water, The Wash, Norfolk, E...

Luiz Claudio Marigo / Subalpine Cloud Andean Mountain Forest, Paramo habitat (Andean high altitude fields). Chingaza Natural National Park, municipality of La Calera, Cundinamarca Department, Colombia, 2011.

Luiz Claudio Marigo / Subalpine Cloud Andean Mountain Forest, Paramo habitat (Andean high altitude fields). Chingaza Natural National Park, municipality of La Calera, Cundinamarca Department, Colombia, 2011.

Bryan and Cherry Alexander / Mountains, bands of cloud and high wind in the Gerlache Strait, Southern Ocean, Antarctica, October 2009.

Bryan and Cherry Alexander / Mountains and bands of cloud and high wind in the Gerlache Strait, Southern Ocean, Antarctica, October 2006.

Colin Monteath / Wind warning sign and high wind clouds, Patagonia, Argentina

Floris van Breugel / A Lenticular cloud formation or know locally as a 'Sierra Wave' which often forms over the Owens Valley in times of high winds before and after storms. Alabama Hills, California, USA, December 2009.

Colin Monteath / Sea of clouds cover Lake Wanaka, seen from Mount Roy, sunrise over Southern Alps, Otago, New Zealand

Rob Brown / Mount Ngauruhoe and Mount Ruapehu, Tongariro National Park, New Zealand

Aflo / Y-9205 Aerial view of clouds

Aflo / Y-9302 Aerial view above cloud layer

Aflo / Y-2206 Clouds in blue sky

Aflo / Y-2706 Sun shining above cumulus clouds in blue sky

Aflo / Y-2802 Sun shining above single cloud in blue sky

Aflo / Y-9505 Clouds pouring over summit of Soraksan, Korea

Aflo / Y-9502 Sun shining above cloud layer in evening

Aflo / Y-9203 Aerial view of clouds around mountain peaks

Aflo / Y-9203 Aerial view high above clouds, sunset horizon

Aflo / Y-9005 Looking down from above high level cloud layer

Aflo / Y-9106 Looking down on high level clouds

Aflo / Y-9002 Looking down on high level clouds above

Aflo / Y-8905 Looking down on high level clouds above

Aflo / Y-9204 Sun shining above cloud level

Aflo / Y-8902 Looking down onto cloud layer with bright sun shining

Aflo / Y-8906 Looking down onto / above high level clouds

Aflo / Y-9902 Bright sun rays above cloud line, Hawaii, USA

Aflo / Y-2501 Clouds low in blue sky

Patricio Robles Gil / Snake resting at the base of bromeliad plant, El Triunfo Biosphere Reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Sixteen mules were required to carry the equipment for the photographic team of the ILCP Rapid Assessment Visual Expedition (RAVE), El Triunfo Biosphere Reserve, Sierra Madre del Sur, Chiapas, Mexico,...

Albert Lleal / Green Arboreal Alligator Lizard (Abronia graminea), endemic to cloud forests of Mexico

Albert Lleal / Green Arboreal Alligator Lizard (Abronia graminea), endemic to cloud forests of Mexico

Chien Lee / Ptari Tepui surrounded by clouds, Venezuela

Kevin Schafer / Sun halo, caused by ice crystals in high clouds, Iceland

James Christensen / Olive Forest Racer (Dendrophidion dendrophis), western slope of the Andes Cloud Forest, Mindo, Ecuador

James Christensen / Olive Forest Racer (Dendrophidion dendrophis), western slope of the Andes Cloud Forest, Mindo, Ecuador

James Christensen / Cat-eyed Snake (Leptodeira annulata), western slope of the Andes Cloud Forest, Mindo, Ecuador

James Christensen / Eyelash Viper (Bothriechis schlegelii) showing caudal luring behavior, western slope of the Andes Cloud Forest, Mindo, Ecuador

James Christensen / Fitzinger's Robber Frog (Craugastor fitzingeri), western slope of the Andes Cloud Forest, Mindo, Ecuador

James Christensen / Eyelash Viper (Bothriechis schlegelii) showing caudal luring behavior, western slope of the Andes Cloud Forest, Mindo, Ecuador

Michael & Patricia Fogden / Caecilian (Gymnopisámultiplicata), Monteverde Cloud Forest, Costa Rica

Michael & Patricia Fogden / Caecilian (Gymnopisámultiplicata) amid leaf litter on forest floor, Monteverde Cloud Forest, Costa Rica

Michael & Patricia Fogden / Coppery-headed Emerald (Elvira cupreiceps) hummingbird male at tree flowers, Monteverde Cloud Forest, Costa Rica

Yva Momatiuk & John Eastcott / King Penguin (Aptenodytes patagonicus) colony at sunset, St. Andrews Bay, South Georgia Island

Grant Dixon / Brocken spectre (shadow cast onto clouds) above Lake Dove, Cradle Mountain-Lake Saint Clair National Park, Tasmania, Australia

Larry Michael / Cumulo nimbus cloud formation, USA

Yva Momatiuk & John Eastcott / High tide surf spreading foam on golden beach in Kahurangi National Park, Pacific Ocean in evening, winter, Westland, South Island, New Zealand

Yva Momatiuk & John Eastcott / High tide surf spreading foam on golden beach in Kahurangi National Park, Pacific Ocean in evening, winter, Westland, South Island, New Zealand

Yva Momatiuk & John Eastcott / Large windfarm at work on ridge in high desert grasslands with a multitude of turning turbines and a big sky full of cumulus clouds, summer, noon, Wyoming

Yva Momatiuk & John Eastcott / Windfarm turbine at work in high desert grasslands, summer, noon, Wyoming

Yva Momatiuk & John Eastcott / Snow-capped Alaska Range and cumulus clouds in blue sky in autumn, Denali National Park, Alaska

Colin Monteath / Wind cloud over Kangchenjunga, Talung face from Dzong Ri, 8585 meters, most easterly of the world's fourteen 8000 metre peaks, Sikkim Himalaya, India

Colin Monteath / Dawn on Kangchenjunga, Talung face from Dzong Ri, 8585 meters, most easterly of the world's fourteen 8000 metre peaks, Sikkim Himalaya, India

Colin Monteath / Mt Sefton, above cloud-filled Mueller Glacier, Mt Cook National Park, New Zealand

Colin Monteath / Mt Sefton, climber above cloud-filled Mueller Glacier, Mt Cook National Park, New Zealand

Colin Monteath / Mt Cook, winter dawn above sea of clouds, Mt Cook National Park, New Zealand

Colin Monteath / Mt Sefton, climber at dawn above Mueller hut and cloud-filled Mueller Glacier, Mt. Cook, also called Aoraki, in the distance, Mt. Cook National Park, New Zealand

Colin Monteath / Mt Sefton, climber at dawn above Mueller hut and cloud-filled Mueller Glacier, Mt Cook National Park, New Zealand

Colin Monteath / Sunset over limestone rocks by sea, winter snow on Kaikoura Range, Kaikoura, New Zealand

Colin Monteath / Hiker at sunset in the Darrans above cloud-filled Hollyford Valley, Fjordland National Park, New Zealand

Colin Monteath / Lower Gasherbrum peaks showing glacial cirques (Bowl shaped basin) and valley glaciers, Baltoro Glacier, Karakoram Mountains, Pakistan

Pete Oxford / Strawberry Tree Frog (Hyla pantosticta) male in cloud forest, Carchi Province, Ecuador

Pete Oxford / Strawberry Tree Frog (Hyla pantosticta) male in cloud forest, Carchi Province, Ecuador