Phil Savoie / Yellow legged mining bee (Andrena flavipes) female at nest burrow, River Monnow, Monmouthshire, Wales, UK, April.

Milan Radisics / Aerial shot of the Hafursa glacial river running over black sand, southern Iceland, August 2018.

Milan Radisics / Aerial shot of a confluence of three tributaries flowing over black sand at the mouth of the Affall River, Landeyjar area, Southern Iceland, August 2018.

Nick Garbutt / Jaguar (Panthera onca) female running along a sand spit chasing after a caiman. Northern Pantanal Cuiaba River, Mato Grosso, Brazil.

Neil Aldridge / African elephant (Loxodonta africana) dust bathing on floodplains, Chobe River, Botswana. Vulnerable species.

Matthias Breiter / Trees in autumn along river, Sand River, Agawa Bay, Ontario, Canada

Charlie Summers / Nile crocodile (Crocodylus niloticus) making its way through sand to the Rufiji River, Selous Game Reserve, Tanzania.

Erlend Haarberg,Erlend Haarberg / Aerial view of river meandering in grey sand in the Landeyjarsandur, Iceland, September 2010.

Erlend Haarberg / Aerial view of river delta and Landeyjarsandur beach, South coast of Iceland, September 2010

Luis Quinta / Schreiber's lizard (Lacerta schreiberi) adult male on river bank with waterfall in background, Geres National Park, Portugal, May.

Alex Mustard / A group of Florida manatees (Trichechus manatus latirostrus) sleeping in the afternoon at Three Sisters Spring. Crystal River, Florida, USA. Manatees sleep on the bottom of the spring, floating up per...

Wild Wonders of Europe / Cairns / Aerial view over Lake Laitaure showing silt deposits from the Rapa river forming sand spits and vegetational growth, Sarek National Park, Sweden., September 2008

Andy Rouse / Grizzly bear (Ursus arctos horribilis) resting by river, Alaska (non-ex)

Andy Rouse / Grizzly bear (Ursus arctos horribilis) resting by river, Alaska (non-ex)

Luiz Claudio Marigo / Negro river with beach of white sand, Sao Gabriel da Cachoeira, Amazonas, Brazil

Phil Savoie / Yellow legged mining bee (Andrena flavipes) female with full pollen baskets, on bank of the River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) female with male following , near nest burrow in bank of the River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) female at nest burrow in bank of the River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Painted nomad bee (Nomada fucata) female, kleptoparasite outside the nest burrow of Yellow legged mining bee (Andrena flavipes) where it will kill the larvae in the burrow before laying its own eggs w...

Phil Savoie / Yellow legged mining bee (Andrena flavipes) males swarming around nest burrows, waiting for females, in bank of the River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) female digging nest in bank of the River Monnow, Monmouthshire, Wales, UK. April.

Phil Savoie / Yellow legged mining bee (Andrena flavipes) male looking for females near nest burrows in river bank, River Monnow, Monmouthshire, Wales, UK. April.

Phil Savoie / Yellow legged mining bee (Andrena flavipes) females near nest burrow in river bank, River Monnow, Monmouthshire, Wales, UK. April 2018.

Phil Savoie / Yellow legged mining bee (Andrena flavipes) female flying to nest burrow, Monmouthshire, Wales, UK. April.

Phil Savoie / Yellow legged mining bee (Andrena flavipes) male outside nest burrow, River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) female with pollen baskets full, outside nest burrow, Monmouthshire, Wales, UK. September

Phil Savoie / Ashy mining bee (Andrena cineraria), outside nest burrow, River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) female outside nest burrow on riverbank, River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) male outside nest burrow on riverbank, River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) male outside nest burrow on riverbank, River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) male outside nest burrow on riverbank, River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) male outside nest burrow on riverbank, River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Painted nomad bee (Nomada fucata) female laying eggs in the nest burrow of Yellow legged mining bee (Andrena flavipes) larva kleptoparasitises pollen store of Andrena flavipes larve killing them, Rive...

Gabriel Rojo / Black skimmer (Rynchops niger) on sand with open beak..Cuiaba River, Pantanal, Mato Grosso, Brazil.

Gabriel Rojo / Yellow-billed tern (Sternula superciliaris) standing on sand with open beak. Cuiaba River, Pantanal, Mato Grosso, Brazil.

Eric Baccega / Sand cliff towering above wildlife biologists in boat on Mpassa river, Bateke Plateau National Park, Gabon. 2019.

Robin Chittenden / River crab (Potamon potamios) on sand. Cyprus. April.

Milan Radisics / Aerial tracking shot of the Hverfisfljot glacial river flowing over a plain of black sand, Iceland, August 2018.

Milan Radisics / Aerial tracking shot of a glacial river flowing through a plain of black sand, Iceland, August 2018.

Milan Radisics / Aerial tracking shot of a glacial river flowing through a plain of black sand, Iceland, August 2018.

Milan Radisics / Aerial shot of a confluence of three tributaries flowing over black sand at the mouth of the Affall River, Landeyjar area, Southern Iceland, August 2018.

Robert Valentic / White-lipped Snake (Drysdalia coronoides) male on coastal sand dune habitat, Powlett River, South Gippsland, Victoria, Australia

Nick Garbutt / Jaguars (Panthera onca) courting pair on a sand bank. Cuiaba River, Northern Pantanal, Mato Grosso, Brazil.

Nick Garbutt / Jaguar (Panthera onca) male running along a sand spit chasing after a caiman. Northern Pantanal Cuiaba River, Mato Grosso, Brazil. Composite image of five frames.

Nick Garbutt / Jaguars (Panthera onca) courting pair on a sand bank. Cuiaba River, Northern Pantanal, Mato Grosso, Brazil.

Nick Garbutt / Jaguars (Panthera onca) courting pair, on a sand bank. Cuiaba River, Northern Pantanal, Mato Grosso, Brazil.

Nick Garbutt / Jaguars (Panthera onca) pair during courtship, on a sand bank. Cuiaba River, Northern Pantanal, Mato Grosso, Brazil.

Nick Garbutt / Jaguars (Panthera onca) pair mating on a sand bank. Cuiaba River, Northern Pantanal, Mato Grosso, Brazil.

Nick Garbutt / Jaguar (Panthera onca) male resting on a sand bank with reflection in the water. Cuiaba River, Northern Pantanal, Mato Grosso, Brazil.

Guy Edwardes / Mawddach estuary at Barmouth, Snowdonia, Wales, UK. February 2006

Guy Edwardes / Landscape of Alnmouth, Northumberland, England, UK, March.

Guy Edwardes / Sand patterns, Pjorsa River, Near Selfoss, Iceland. August 2017

Guy Edwardes / Patterns in Holsa River, near Hella, Iceland. August 2017

Guy Edwardes / Patterns in Holsa River, near Hella, Iceland. August 2017

Ashley Cooper / Aerial view of flooded farmland around Makhanga, which two months after the January 2015 floods, is still cut off after rail and road connections were washed away. Malawi, March 2015.

Ashley Cooper / Aerial view of flooded farmland around Makhanga, which two months after the January 2015 floods, is still cut off after rail and road connections which were washed away. Malawi, March 2015.

Ashley Cooper / Aerial view of flooded farmland around Makhanga, which two months after the January 2015 floods, is still cut off after rail and road connections were washed away. Malawi, March 2015.

Ashley Cooper / Aerial view of flooded farmland around Makhanga, which two months after the January 2015 floods, is still cut off after rail and road connections were washed away. Malawi, March 2015.

Ashley Cooper / Aerial view of flooded farmland around Makhanga, which two months after the January 2015 floods, is still cut off after rail and road connections were washed away. Malawi, March 2015.

Ashley Cooper / Aerial view of flooded farmland and roads after the January 2015. Makhanga, Malawi. March 2015.

Ashley Cooper / Aerial view of land flooded by the January 2015 floods with washed away road, near Makhanga, Malawi, March 2015.

Ashley Cooper / Flood waters and farmland destroyed after the January 2015 flooding, Malawi, March 2015.

Ashley Cooper / Farmland flooded and covered in debris after the January 2015 flooding, Malawi, March 2015.

Ashley Cooper / Farmland flooded and covered in debris after the January 2015 flooding, Malawi, March 2015.

Ashley Cooper / Farmland flooded and covered in debris after the January 2015 flooding, Malawi, March 2015.

Ashley Cooper / Farmland flooded and covered in debris after the January 2015 flooding, Malawi, March 2015.

Ashley Cooper / The irony of solar powered CCTV at Shell's Albian sands tar sands mine. The tar sands are the largest industrial project on the planet, and the world's most environmentally destructive. The synthetic...

Ashley Cooper / Tar sands deposits exposed in the side of the Athabasca River, Fort McMurray, Alberta, Canada. August 2012

Ashley Cooper / Tar sands deposits mining north of Fort McMurray, Alberta, Canada. August 2012

Ashley Cooper / The tailings pond at the Syncrude mine north of Fort McMurray, Alberta, Canada. Tailings ponds in the tar sands are unlined and leach toxic chemicals into the surrounding environment. In addition, tho...

Ashley Cooper / Tar sands deposits being mined at the Syncrude mine north of Fort McMurray, Alberta, Canada. The tar sands are the largest industrial project on the planet, and the world's most environmentally destru...

Ashley Cooper / Clear water from Dettifoss waterfall mixing with glacial meltwater of River Jokulsa a Fjollum from the Vatnajokull ice sheet. Iceland, September 2010

Ashley Cooper / Bridge to cross river which has dried up during the drought which lasted from 1996-2011. Victoria, Australia, February 2010.

Ashley Cooper / Boat launching ramp high above the water levels during the drought which lasted from 1996-2011. Victoria, Australia, February 2010.

Ashley Cooper / Dried up river in Shanxi province during drought, China, March 2009.

Ashley Cooper / Very low water levels in river during severe drought, Shanxi province, China, March 2009.

Ashley Cooper / Very low water levels in river during severe drought, Shanxi province, China, March 2009.

Ashley Cooper / Critically low river in Shanxi province during severe drought, China, March 2009.

Ashley Cooper / Dried up river bed in the Anti Atlas mountains of Morocco, North Africa. April 2012. In recent years, rainfall totals have reduced by around 75% as a result of climate change.

Phil Savoie / Sand Martin (Riparia riparia) in flight catching insects over the Madison River, Montana, USA. May.

Phil Savoie / Reflection of Sand Martin (Riparia riparia) hunting Speckled mayfly (Callibaetis sp.) Madison River, Montana, USA, May.

Phil Savoie / Sand martin (Riparia riparia) in flight, hunting insects above the Madison River, Montana, USA, June.

Andy Trowbridge / Black / New Zealand stilt (Himantopus novaezelandiae) standing on fine sand. Ashley River, Canterbury, New Zealand. July. Critically Endangered Species.

Graham Eaton / A sand-spit developing at the mouth of the River Soch at Abersoch, Gwynedd, Wales, UK, April

Christophe Courteau / African elephant (Loxodonta africana) dust bathing in the dry Hoanib River, Damaraland, Namibia.

Charlie Summers / Nile crocodile (Crocodylus niloticus) kicking up sand as it returns to the Rufiji River, Selous Game Reserve, Tanzania.

Charlie Summers / Nile crocodile (Crocodylus niloticus) making its way down sand bank into to the Rufiji Rivre, Selous Game Reserve, Tanzania.

Nick Upton / Red admiral butterfly (Vanessa atalanta) mud-puddling for moisture and minerals on riverbank sand, River Avon, Lacock, Wiltshire, UK, July.

Nick Upton / Red admiral butterfly (Vanessa atalanta) mud-puddling for moisture and minerals on riverbank sand, River Avon, Lacock, Wiltshire, UK, July.

Christophe Courteau / Panoramic view across Sand River, Mala Mala Game Reserve, South Africa.

Christophe Courteau / Leopard (Panthera pardus) young female jumping across a river, Sabi Sand Private Game Reserve. South Africa.

Christophe Courteau / Leopard (Panthera pardus) male crossing river at night, Sabi Sand Private Game Reserve. South Africa.

SCOTLAND: The Big Picture / European river otter (Lutra lutra) footprints in the sand, Shetland, Scotland, UK, February. Small repro only.

Franco Banfi / River stingray (Potamotrygon sp.) half hidden in sand, Paraguay River, Pantanal, Brazil

Franco Banfi / River stingray (Potamotrygon sp) covered in sand, Triste River, Nobres, Mato Grosso, Brazil

Franco Banfi / River stingray (Potamotrygon sp.) camouflaged in sand, Paraguay River, Pantanal, Brazil