Mark Bowler / Aerial view of Amazon rainforest with river, Peru

Sven Zacek / Meandering Loobu River with surrounding meadows and woodlands, aerial view. Lahemaa National Park in Northern Estonia in Laane-Virumaa, Estonia. May 2017.

Franco Banfi / Close view of a Green anaconda, (Eunectes murinus) underwater, Formoso River, Bonito, Mato Grosso do Sul, Brazil

Guy Edwardes / Waterfall in Fjaorargljufur canyon, Kirkjubaejarklaustur, Iceland, August 2017.

Nick Garbutt / Red-and-green macaw (Ara chloropterus) flock flying in front of clay lick. Heath River, Tambopata / Bahuaja-Sonene Reserves, Amazonia, Peru / Bolivia border.

Remi Masson / Group of Wels catfish (Silurus glanis) gathered in the River Rhone, France, August.

Guy Edwardes / River Fowey flowing through Beech (Fagus sylvatica) woodland, Golitha Falls, Bodmin Moor, Cornwall, England, UK. May 2010.

Danny Green / Coastal brown bear (Ursus arctos) fishing, Lake Clarke National Park, Alaska, September

Andy Rouse / Kingfisher (Alcedo atthis) on perch, UK, January.

Lucas Bustamante / Scarlet macaws (Ara macao) and Red and green macaws (Ara chloroptera) at clay lick close to the Tambopata river. Tambopata Reserve, Madre de Dios, Peru.

Sergey Gorshkov / Aurora borealis over river, Putoransky State Nature Reserve, Putorana Plateau, Siberia, Russia

Mark MacEwen / Japanese firefly (Luciola cruciata) light trails at night above stream in rural Japan. June.

Juan Carlos Munoz / Aerial view of Delta Sierpe River Terraba, Corcovado National Park, Osa Peninsula, Puntarenas Province, Costa Rica. December 2014.

Juan Carlos Munoz / Tourists looking down onto underground stream, from illuminated pathway, Skocjan Caves, Green Karst, Slovenia, October 2014.

George Sanker / Golden-mantled ground squirrel (Callospermophilus lateralis) feeding on flowers, Yellowstone National Park, Wyoming, USA, June.

Pal Hermansen / Aerial view of river delta, South West Iceland, June 2014.

Nick Garbutt / Malachite Butterfly (Siproeta stelenes) hanging upside down on leaf, forest near Napo River, Amazonia, Ecuador, South America.

Michel Poinsignon / Kingfisher(Alcedo atthis) male perched on branch over river with fish in beak, Lorraine, France. May.

David Noton / Aurora Borealis (Northern Lights) over the Klondike River, Yukon Territories, Canada, September 2013.

Ross Hoddinott / The Northern Lights / Aurora Borealis over a river, Vik, Iceland. February 2014.

Neil Aldridge / Okavango robbers (Rhabdalestes maunensis) fish swimming up the temporary Selinda Spillway, northern Botswana. This shallow river cuts across the Kalahari Desert and joins the Okavango River system wit...

Luciano Candisani / Flooded fields, Pantanal, Brazil

Franco Banfi / Green anaconda (Eunectes murinus) underwater, flicking tongue, Formoso River, Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Green anaconda (Eunectes murinus) swimming inFormoso River, Bonito, Mato Grosso do Sul, Brazil

Wild Wonders of Europe / Lundgren / Pool Frog (Pelophylax lessonae) viewed from below while swimming, underwater around Crisan village, Danube Delta, Romania, June.

Michel Roggo / Anavilhanas Archipelago in the Rio Negro, and flooded forest or 'Varzea forest' Amazonas, Brazil. February 2011

Juan Carlos Munoz / Aerial view of the River Kinabatangan and riverine tropical rainforest, Sabah, Malaysia, Borneo, Asia.

Chris Gomersall / 2020VISION / European river otter (Lutra lutra) cub amongst kelp on shoreline, Shetland Isles, Scotland, UK, October.

Ross Hoddinott / 2020VISION / Golitha Falls, River Fowey flowing through wooded valley with moss covered trees, Nr St Cleer, Cornwall, UK, May 2012

Andy Trowbridge / Split level shot of a fly fisherman (Murray Trowbridge) releasing a large brown trout (Salmo trutta) in a gin clear 'backcountry' river, North Canterbury South Island, New Zealand. January, 2012. Mode...

Michel Poinsignon / River view between Leon pond and Atlantic ocean, Courant D'Huchet Landes, France, August 2010.

Danny Green / 2020VISION / Two European river otters (Lutra lutra) fighting over a fish, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / European river otter (Lutra lutra) eating fish on seaweed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / European river otter (Lutra lutra) resting amongst the seaweed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / Two European river otters (Lutra lutra) play fighting in the water, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / European river otters (Lutra lutra) play fighting amongst seaweed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / Three European river otters (Lutra lutra) resting amongst seaweed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / Two European river otters (Lutra lutra) swimming in shallow water, Isle of Mull, Inner Hebrides, Scotland, UK, December. Did you know? 12% of breeding otters in the UK live in the Shetland Isles.

Danny Green / 2020VISION / Otters (Lutra lutra) resting amongst the seaweed, Isle of Mull, Scotland, UK

Willem Kolvoort / Aquatic plants in River Black Drim, Albania, Eastern Europe, May

Danny Green / 2020VISION / Red deer (Cervus elaphus) stag crossing a river, Bradgate Park, Leicestershire, England, UK, October

Alex Hyde / The Fairy Pools, on the Allt Coir' a' Mhadaidh river running down from the Cullin Hills, Glen Brittle, Isle of Skye, Inner Hebrides, Scotland, UK, February 2010.

Alex Hyde / The Fairy Pools, on the Allt Coir' a' Mhadaidh river running down from the Cullin Hills, Glen Brittle, Isle of Skye, Inner Hebrides, Scotland, UK, February 2010.

Orsolya Haarberg / Red deer (Cervus elaphus) herd wading through water in a flooded forest, Danube-Drava National Park, Hungary.

John Cancalosi / Fossil Ray (Heliobatis sp) from the Eocene Epoch, surrounded by bony fish. Green River Formation, Wyoming, USA

Pete Oxford / Giant leaf frog (Phyllomedusa bicolor) climbing along branch in rainforest, Iwokrama Reserve, Guyana

Jerry Monkman / Roaring Brook, a tributary of Batten Kill river, in the Green Mountain National Forest, Sunderland, Vermont, USA, October 2009

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) flying, threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Michel Roggo / Underwater landscape in Spring creek, Saane river tributary, in winter, Gruyre, Fribourg, Switzerland. February

Michel Roggo / Looking down at Chubb (Leuciscus cephalus) at surface with reflection of bridge, Rhine River, Switzerland, 1993. No release available.

Aflo / N-14708 Waterfall falling onto mossy stones, Nagano, Japan.

Aflo / N-13704 Waterfall in woodland with Azalea trees in flower, Tochigi, Japan.

Aflo / N-13802 River and waterfall in woodland, Aomori, Japan.

Aflo / N-13804 River and waterfall in woodland, Aomori, Japan.

Aflo / N-13603 River flowing through woodland with Azalea trees in flower, Tochigi, Japan.

Aflo / N-14405 Double waterfall in woodland, Tochigi, Japan.

Wild Wonders of Europe / Roggo / Barbel (Barbus barbus) feeding at the bottom of a pool, Sense river, Fribourg, Switzerland, June 2008

Stephen Dalton / Wallace's / Abah river flying frog (Rhacophorus nigropalmatus) gliding, controlled conditions, showing use of webbed feet, from Malaysia and Indonesia

Wild Wonders of Europe / Radisics / Aquatic plants at the edge of River Crnojevica, near Pavlova Strana, Rijeka Crnojevica, Lake Skadar National Park, Montenegro, May 2008

Wild Wonders of Europe / Ruiz / Krinice River in wood, Dlouhy Dul, Ceske Svycarsko / Bohemian Switzerland National Park, Czech Republic, September 2008

Juan Carlos Munoz / Woodland trees reflected on river water, Finland

Igor Shpilenok / Aerial view of the Zhupanov river and surrounding wetlands just south of the Kronotsky Zapovednik, Kamchatka, Far East Russia

Jouan & Rius / Aerial view of river and mangrove forest, West coast, Madagascar

Jose B. Ruiz / Water from the Ro Tinto, or Red River, very acidic and coloured by minerals dissolved in the water that drains from the local Riotinto mines causing severe environmental problems. Huelva, Spain

Nick Garbutt / Morpho butterfly {Morpho achilles} Napo River, Amazon Basin, Ecuador

Mitsuaki Iwago / Hippopotamus (Hippopotamus amphibius) emerging from a river full of water lettuce, Botswana

Konrad Wothe / Hopetoun Falls on the Aire River flowing through rainforest, Otway National Park, Victoria, Australia

Patricio Robles Gil / Guayalejo River flowing through cloud forest, Tamaulipas, Sierra Madre Oriental, northeast Mexico

Gerry Ellis / Temperate rainforest with moss covered trees and ferns, Queets River Valley, Olympic National Park, Washington

Pete Oxford / River and trees in the Amazon rainforest, Ecuador

Tim Fitzharris / Roaring fork river, Great Smoky Mountains National Park, Tennessee

Tim Fitzharris / Multnomah Falls cascading through temperate rainforest, Columbia River Gorge near Portland, Oregon

Pete Oxford / Three species of Macaw on clay lick. Red & Green macaw, Scarlet macaw and Blue & Yellow macaw {Ara Chloroptera, Ara Macao, Ara araraunaon} Timpia clay lick, Urubamba River. Amazon Rainforest, Peru. S...

Staffan Widstrand / River rushing through tropical rainforest, Mazaruni, Guyana, South America.

Pete Oxford / Green winged macaws perched by salt lick. Madre De Dios River, Peru, Amazon, South America

Jack Dykinga / Patterns in the tidal flats of the delta where the delta is swept by tidal encroachment from the Gulf of California. Evidence of the fresh water flow is observable as plant life turns green. Colorado...

Jack Dykinga / Patterns in the tidal flats of the delta where the delta is swept by tidal encroachment from the Gulf of California. Evidence of the fresh water flow is observable as plant life turns green. Colorado...

Jack Dykinga / Patterns in the tidal flats of the delta where the delta is swept by tidal encroachment from the Gulf of California. Evidence of the fresh water flow is observable as plant life turns green. Colorado...

Jack Dykinga / Cienega de Santa Clara / Santa Clara wetlands which are supported by agricultural waste water from the U.S. and Mexico. Colorado River Delta region's estuary marshes. USA September 2019.. Aerial s...

Jack Dykinga / Cienega de Santa Clara / Santa Clara wetlands which are supported by agricultural waste water from the U.S. and Mexico. Colorado River Delta region's estuary marshes. USA September 2019. Aerial su...

Jack Dykinga / Cienega de Santa Clara / Santa Clara wetlands which are supported by agricultural waste water from the U.S. and Mexico. Colorado River Delta region's estuary marshes. USA September 2019.. Aerial s...

Jack Dykinga / Patterns in the tidal flats of the delta where the delta is swept by tidal encroachment from the Gulf of California. Evidence of the fresh water flow is observable as plant life turns green. Colorado...

Jack Dykinga / Patterns in the tidal flats of the delta where the delta is swept by tidal encroachment from the Gulf of California. Evidence of the fresh water flow is observable as plant life turns green. Colorado...

Jack Dykinga / Cienega de Santa Clara / Santa Clara wetlands which are supported by agricultural waste water from the U.S. and Mexico. Colorado River Delta region's estuary marshes. USA September 2019. Aerial su...

Jack Dykinga / Patterns in the tidal flats of the Colorado River Delta where the delta is swept by tidal encroachment from the Gulf of California. Receding tide causes waterfalls approximately eight feet high, as...

Jack Dykinga / Patterns in the tidal flats of the Colorado River Delta where the delta is swept by tidal encroachment from the Gulf of California. Receding tide causes waterfalls approximately eight feet high, as wa...

Oscar Dewhurst / Yellow-billed teal (Anas flavirostris) perched on rock in river. Arequipa, Peru. September. Cropped

Milan Radisics / Aerial shot of Fjadrargljufur gorge, near Kirkjubaejarklastur, South Iceland, August 2018.

Marie Read / White pelicans (Pelecanus erythrorhynchos) at Bear River Migratory Bird Refuge with an approaching storm in May, Utah, USA, May.

Marie Read / Yellow-headed Blackbird (Xanthocephalus xanthocephalus) male perched in marsh vegetation (Phragmites) in foreground. Bear River Migratory Bird Refuge, view toward east, with Wasatch Mountains in dista...

Duncan Murrell / Palm tree, Blue River Provincial Park, South Province, New Caledonia.

Duncan Murrell / Dracophyllum in the Blue River Provincial Park, South Province, New Caledonia.

Pascal Tordeux / La Semoy river, Ardennes, Belgium. September 2018.

Sven Zacek / Flooded woodland and river upstream of a Beaver (Castor fiber) dam. Valgamaa, Southern Estonia. June.

Sven Zacek / Red squirrel (Sciurus vulgaris) crossing log over river surrounded by ferns. Lahemaa National Park, Laane-Virumaa, Estonia. July.