Theo Bosboom / Patterns of algae on a limestone rock with sand, White sands beach, Causeway coast, Northern Ireland. April 2016.

Yva Momatiuk & John Eastcott / Ripples on white gypsum sand dunes, White Sands National Park, New Mexico

Sergey Gorshkov / Red-billed Oxpecker (Buphagus erythrorhynchus) trio on White Rhinoceros (Ceratotherium simum), Sabi-sands Game Reserve, South Africa

Andy Sands / Newly emerged Marbled white butterfly (Melanargia galathea) on Bee orchid (Ophrys apifera), Bedfordshire, England, UK. June

Jack Dykinga / Yuccas (Yucca elata) silhouetted against the moon and morning light, White Sands National Park, New Mexico. January.

Jouan Rius / Gypsum sand dune at sunset, White Sands National Park, Chihuahuan Desert, New Mexico, USA, December 2012.

Jack Dykinga / White Sands National Park with its white gypsum dunes dotted with Yuccas (Yucca elata) creating patterns amid the dunes, at sunset. White Sands, New Mexico. January 2013

Jack Dykinga / White Sands National Park with its white gypsum dunes dotted with Yuccas (Yucca elata) creating patterns amid the dunes. White Sands, New Mexico, USA. January 2013

Andy Sands / Mistle Thrush (Turdus viscivorus) in snow. Hertfordshire, England, UK, February.

Daniel Heuclin / Rio Grande Cottonwood tree (Populus fremonti wislizenii) on a sand "pedestal" White Sands National Park. New-Mexico, USA, August 2009

Floris van Breugel / View of snow-like dunes of the White Sands National Park. These sand grains consist of tiny crystals of gypsum. New Mexico, USA, April 2010

Andy Sands / Stoat (Mustela erminea) in partial white winter ermine coat, captive, UK. British stoats rarely assume full winter ermine coast. This animal originated from Teesdale, County Durham.

Andy Sands / Wood White butterfly (Leptidea sinapis) feeding on flower of Purple Milk-vetch, Captive, UK,

Rob Tilley / White sand dunes against blue sky, White Sands National Park, New Mexico, USA, February 2009

Rob Tilley / White sand dunes against blue sky, White Sands National Park, New Mexico, USA, February 2009

Rob Tilley / White sand dunes against blue sky, White Sands National Park, New Mexico, USA, February 2009

Andy Sands / Green veined white butterfly (Pieris napi) captive, on flower of Greater stitchwort (Stellaria holostea), UK.

Andy Sands / Marbled White butterfly (Melanargia galathea) covered in dew at dawn, Hertfordshire, England, UK

Tim Fitzharris / Cloud over White Sands National Park, Chihuahuan Desert, New Mexico

John Shaw / Frost on soaptree yuccas (Yucca elata) and winter morning fog, in the gypsum sand dunes of White Sands National Park, New Mexico, USA. January.

John Shaw / Soaptree yucca (Yucca elata) on the gypsum sand dunes at White Sands National Park, New Mexico, USA. January.

John Shaw / Soaptree yucca (Yucca elata) and twilight sky, showing Belt of Venus (blue of earth's shadow on the atsmophere below pink of sunset). White Sands National Park, New Mexico, USA. November.

John Shaw / Soaptree yucca (Yucca elata) at sunset. White Sands National Park, New Mexico, USA. November.

John Shaw / Soaptree yucca (Yucca elata) in predawn light, and San Andres Mountains. White Sands National Park, New Mexico, USA. November.

John Shaw / Soaptree yucca (Yucca elata) and gypsum sand dune at twilight, with the Belt of Venus (the blue of Earth's shadow below the pink sky of sunset). White Sands National Park, New Mexico, USA. Jan...

John Shaw / Soaptree yucca (Yucca elata) and gypsum sand dunes at sunset, with San Adres mountains in distance. White Sands National Park, New Mexico, USA. January.

John Shaw / Frost on soaptree yuccas (Yucca elata) and winter morning fog, in the gypsum sand dunes of White Sands National Park, New Mexico, USA. January.

Tim Fitzharris / Agave (Agave sp) in desert, White Sands National Park, New Mexico

John Shaw / Soaptree yucca (Yucca elata) at sunset. White Sands National Park, New Mexico, USA. January.

Suzi Eszterhas / White rhino (Ceratotherium simum), portrait of male with wounds and scars from territorial fighting. Sabi Sands Game Reserve, South Africa.

Suzi Eszterhas / White rhino (Ceratotherium simum), two walking towards camera in morning light. Sabi Sands Game Reserve, South Africa.

Suzi Eszterhas / White rhino (Ceratotherium simum) with safari tourists watching, Sabi Sands, South Africa

Suzi Eszterhas / White rhino (Ceratotherium simum) Sabi Sands, South Africa

Suzi Eszterhas / Side-striped Jackal (Canis adustus) and White-backed Vultures (Gyps africanus), Sabi Sands Private Game Reserve, South Africa

Andy Sands / Green Veined White Butterfly (Pieris napi) Roosting on Bluebell flower, Cambridgeshire, England, UK, April

Andy Sands / Green Veined White Butterfly (Pieris napi) Roosting on Bluebell flower, Cambridgeshire, England, UK, April

David Fleetham / Saddleback clownfish / Yellowfin anemonefish (Amphiprion polymnus), female, breeding male and non-breeding males with host Leathery anemone (Heteractis crispa). Philippines.

Alain Dragesco-Joffe / Egyptian vulture (Neophron percnopterus) Tenere, Niger, Sahara.

Juergen & Christine Sohns / White Rhinoceros (Ceratotherium simum), Sabi-sands Game Reserve, South Africa

Juergen Freund / Split level - blue starfish (Linckia laevigata) scattered in the shallow white sands and a nearby mangrove island, Nukubati Island Resort, Macuata Province, Fiji, South Pacific

Juergen Freund / Split level - blue starfish (Linckia laevigata) scattered in the shallow white sands and a nearby mangrove island, Nukubati Island Resort, Macuata Province, Fiji, South Pacific

Juergen Freund / Split level view blue starfish (Linckia laevigata) scattered in the shallow white sands and a mangrove tree with its numerous aerial root (Rhizophora sp), Nukubati Island Resort, Macuata Province, Fij...

Juergen Freund / Woman walking on white sands of Fitzroy Island, Tropical Far North Queensland, Australia, December 2015. Model released.

Juergen Freund / Ochre-coloured earth and sandstone cliffs with white sands beach Dampier Peninsula, Broome, Kimberley, Western Australia. July 2016.

Juergen Freund / Ochre-coloured earth and sandstone cliffs with white sands beach Dampier Peninsula, Kimberley, Western Australia. July 2016.

Juergen Freund / Ochre-coloured earth and sandstone cliffs with white sands beach Dampier Peninsula, Kimberley, Western Australia. July 2016.

Juergen Freund / Footsteps on the white sands, Broome, Kimberley, Western Australia. July 2016.

Juergen Freund / White sand beach with sandstone cliffs, Dampier Peninsula, Kimberley, Western Australia. July 2016.

Juergen Freund / Footsteps on the white sands, Broome, Kimberley, Western Australia. July 2016.

Juergen Freund / Beach waves on the white sands, Broome, Dampier Peninsula, Kimberley Western Australia, Australia July 2016.

Juergen Freund / White sand beach, Dampier Peninsula, Kimberley, Western Australia. July 2016.

Juergen Freund / Spectacular views of ochre-coloured earth and sandstone cliffs, white sands and aquamarine waters of the Dampier Peninsula is one of the most spectacular coastal environments in Australia and a great...

Juergen Freund / Spectacular views of ochre-coloured earth and sandstone cliffs, white sands and aquamarine waters of the Dampier Peninsula is one of the most spectacular coastal environments in Australia and a great...

Juergen Freund / Beach waves on the white sands. Spectacular views of ochre-coloured earth and sandstone cliffs, white sands and aquamarine waters of the Dampier Peninsula is one of the most spectacular coastal enviro...

Juergen Freund / Reflections on the waters along the beach. Spectacular views of ochre-coloured earth and sandstone cliffs, white sands and aquamarine waters of the Dampier Peninsula is one of the most spectacular coa...

Juergen Freund / Sandstone cliffs and white sands, Broome, Dampier Peninsula Kimberley, Western Australia. July 2016.

Juergen Freund / Footsteps on the white sands, Kimberley, Broome, Western Australia, Australia July 2016.

Andy Sands / Wood White butterfly (Leptidea sinapis) on Germander Speedwell (Veronica chamaedrys), Surrey, England, UK, May - Focus Stacked

Andy Sands / Marbled white butterfly (Melanargia galathea) feeding on Knapweed flower in meadow, Hertfordshire, England, UK - Focus Stacked Image

Andy Sands / Marbled white butterfly (Melanargia galathea) on Oxeye daisy, Hertfordshire, England, UK - Focus Stacked Image

Andy Sands / Wood white butterfly (Leptidea sinapis) on Greater stitchwort (Stellaria holostea), Surrey, England, UK, May - Focus Stacked

Andy Sands / Wood White butterfly (Leptidea sinapis) on Early Forget-me-not (Myosotis ramosissima), Surrey, England, UK, May - Focus Stacked

Ingo Arndt / Soaptree Yucca (Yucca elata) flowering in gypsum sand, White Sands National Park, New Mexico, USA

Ingo Arndt / Soaptree Yucca (Yucca elata) flowering in gypsum sand, White Sands National Park, New Mexico, USA

Ingo Arndt / Soaptree Yucca (Yucca elata) in gypsum sand, White Sands National Park, New Mexico, USA

Graham Eaton / Whitemouth moray eel (Gymnothorax meleagris) swimming in shallow water, Maldives, Indian Ocean.

Andy Sands / Large white butterfly (Pieris brassicae) Roosting with wings closed, Oxfordshire, England, UK, July

Andy Sands / Flower Longhorn Beetle (Stenurella melanura) feeding on wild rose flower, Buckinghamshire, England, UK, June

Andy Sands / Marbled white butterfly (Melanargia galathea) Male fviewed from above with wings open, Oxfordshire, England, UK, June

Andy Sands / Marbled white butterfly (Melanargia galathea) Male feeding on Bramble flower, Oxfordshire, England, UK, June

Suzi Eszterhas / White Rhinoceros (Ceratotherium simum) wallowing in mud, Sabi-sands Game Reserve, South Africa

Carol Walker / Grey Arabian stallion kicking up heels in desert dunes near Dubai, United Arab Emirates.

Sergey Gorshkov / White rhinoceroses (Ceratotherium simum) two standing in savannah, Londolozi Private Game Reserve, Sabi Sands Game Reserve, South Africa.

Merryn Thomas / White sand beach with view to Old Grimsby, Tresco, Isles of Scilly, England. May 2013.

Andy Sands / Large white butterfly (Pieris brassicae) full grown caterpillar on cabbage leaf, Hertfordshire, England, UK, September

Andy Sands / Bonnet fungi (Mycena sp.) black and white image of group of toadstools growing on dead wood, Bedfordshire, England, UK, November . Focus stacked image

Andy Sands / Large white butterfly (Pieris brassicae) close up side view of eggs with fully formed caterpillars inside, UK, captive . Focus stacked image

Andy Sands / Large white butterfly (Pieris brassicae) newly created chrysalis on inside of shed roof, Hertfordshire, England, UK, September

Andy Sands / Large white butterfly (Pieris brassicae) newly emerged caterpillars feeding on cabbage leaf, Hertfordshire, England, UK, August

Andy Sands / Ant damsel bug (Himacerus mirmicoides) late instar nymph that mimics ant by having white second and thirds abdominal segments giving the illusion of a narrow waist, Surrey, England, UK, July

Andy Sands / Ant damsel bug (Himacerus mirmicoides) late instar nymph that mimics ant by having white second and thirds abdominal segments giving the illusion of a narrow waist, Surrey, England, UK, July

Andy Sands / White alder sawfly larva (Eriocampa ovata) walking along alder leaf stem, Surrey, England, UK, June

Andy Sands / White saddle fungus (Helvella crispa) Bedfordshire, England, UK . Focus stacked image

Andy Sands / Large white butterfly (Pieris brassicae) close up side view of newly laid eggs showing yellow coloured yolk inside, UK, captive . Focus stacked image - sequence 1 of 2

Andy Sands / Large white butterfly (Pieris brassicae) close up side view of eggs with fully formed caterpillars inside, UK, captive . Focus stacked image - sequence 2 of 2

Andy Sands / Greater butterfly orchid (Platanthera chlorantha) close up of individual flower, Bedfordshire, England, UK, June . Focus stacked image

Andy Sands / Large white butterfly (Pieris brassicae) newly emerged caterpillars feeding on their egg cases on cabbage leaf, Hertfordshire, England, UK, August

Cyril Ruoso / White Wagtail (Motacilla alba) on a sand dune, Baie de Somme Nature Reserve, Picardie, France April

Andy Sands / Large white butterfly (Pieris brassicae) close up side view of eggs with fully formed caterpillars inside, UK, Captive - Focus stacked image - sequence 2 of 2

Andy Sands / Greater stitchwort (Stellaria holostea) Hertfordshire, England, UK, April - Focus stacked image.

Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in autumn,, Rocky Mountains, Colorado

Yva Momatiuk & John Eastcott / Gypsum sand dune, White Sands National Park, New Mexico

Yva Momatiuk & John Eastcott / Gypsum sand dune at sunset, White Sands National Park, New Mexico

Yva Momatiuk & John Eastcott / Sandhill Crane (Grus canadensis) flock flying, White Sands National Park, New Mexico

Yva Momatiuk & John Eastcott / Gypsum sand dunes, White Sands National Park, New Mexico