Will Watson / Himalayan balsam (Impatiens glandulifera) in flower along riverbank, with fly fisherman casting on the River Wye, Breinton, Herefordshire, England, UK. September, 2023. Model released.

Will Watson / Fly fisherman casting on the River Wye, rapids at Breinton, Herefordshire, England, UK. September, 2023. Model released.

Andres M. Dominguez / Eurasian kingfisher (Alcedo atthis) male, perched on a rock in pool, backlit at dawn, Sierra de Grazalema Natural Park, Cadiz, Spain. October.

Dr. Axel Gebauer / Aerial view of Red deer (Cervus elaphus) walking through pond with Water caltrop (Trapa natans) and blue bacteria, surrounded by Reedbeds (Phragmites australis), Biosphere Reserve, Upper Lusatia, Pola...

Jack Dykinga / Aurora borealis in the night sky with autumnal colored Aspen (Populus sp.) and Birch (Betula sp.) trees illuminated by moonlight, in marshland around Obed Lake, Alberta, Canada. September, 2023.

Jack Dykinga / Aurora borealis in the night sky with autumnal colored Aspen (Populus sp.) and Birch (Betula sp.) trees illuminated by moonlight, in marshland around Obed Lake, Alberta, Canada. September, 2023.

Mark Carwardine / European swallow (Hirundo rustica) flying low over water to drink, Hungary. June.

Mark Carwardine / Brown bear (Ursus arctos) female, standing at edge of river, Great Bear Rainforest, British Columbia, Canada. October.

Pal Hermansen / Group of male Toads (Bufo bufo) trying to mate with female, underwater in small lake, Akershus, Norway. May.

Roger Powell / Four Greylag geese (Anser anser) flying low over lake, East Chevington Reserve, Druridge Bay, Northumberland, UK. November.

Sven Zacek / Common blue damselflies (Enallagma cyathigerum) pair, in flight over bog pool, Nigula Nature Protection Area, Parnumaa county, Estonia.

Sven Zacek / Aerial view of sunset after rainy day over Lake Saarjarv in Vorumaa county, Karula National Park, Estonia.

Guy Edwardes / European pond turtle/terrapin (Emys orbicularis) swimming in pond with head above water and a fly resting on its snout, near Bratsigovo, Bulgaria, May

Joel Sartore / Photo Ark / Bigclaw crayfish (Faxonius placidus) female oxygenating eggs by fanning them, upper Duck River, Coffee County, Tennessee, USA. Controlled conditions.

Staffan Widstrand / Red-necked phalarope (Phalaropus lobatus) on water, Varanger Peninsula, Finnmark, Norway. June.

Paul Harcourt Davies / View inside the Diros Caves, with underground river, stalagmites and stalactites in limestone, south of Areopolis, Mani, Peloponnese, Greece. March, 2015.

Jack Perks / Shoal of Roach (Rutilus rutilus) and Perch (Perca fluviatilis). A Brown trout (salmo trutta) swims into the frame, startling the shoal, as it looks for prey. The fish swims out of the frame. Rutland,...

Jack Perks / Sea trout (Salmo trutta) pair courting, in preparation to spawning. The male quivers near the female and then she uses her tail fin to dig a shallow depression (a redd). Perthshire, UK, November.

Jack Perks / Sea trout (Salmo trutta) pair courting, in preparation to spawning. The female uses her tail fin to dig a shallow depression (a redd) and then the male quivers near her. Perthshire, UK, November.

Jack Perks / Atlantic salmon (Salmo salar) pair courting. The female is digging a redd with her tail fin. The pair display courtship as they prepare to spawn. Perthshire, UK, November.

Jack Perks / Ruffe (Gymnocephalus cernua) shoal swimming in deep water, Oxfordshire, UK.

Jack Perks / Pike (Esox lucius) catching a Mayfly (Ephemeroptera sp.) as it emerges, Hampshire, UK, May.

Jack Perks / Common carp (Cyprinus carpio) swimming in a river, feeding on Zebra mussels (Dreissena polymorpha). The animal swims out of the frame. London, UK.

Jack Perks / Chubs (Squalius cephalus) gathering as they prepare to spawn. A shoal of Minnows (Phoxinus phoxinus) are swimming nearby. Nottinghamshire UK , May.

Jack Perks / Mirror carp (Cyprinus carpio) swimming into frame and past the camera. The animal disappears into the murky water. Shropshire, UK.

Jack Perks / Brown trout (Salmo trutta) pair courting. The male quivers near the female and then she uses her tail fin to dig a shallow depression (a redd). Chalk stream, Cambridgeshire, UK. January.

Jack Perks / Common bream (Abramis brama) shoal swimming past, in a shallow river. The fish swim off into the background. Hampshire, UK.

Jack Perks / Common barbel (Barbus barbus) appearing and feeding at the bottom of the river alongisde Common dace (Leuciscus leuciscus). The Barbel swims out of the frame. Nottinghamshire, UK.

Tim Laman / Sunrise illuminating mist rising from the surface of Walden Pond, viewed through branches of Maple (Acer sp.) tree with autumnal foliage, Walden Pond, Concord, Massachusetts, USA. November.

Konrad Wothe / Dipper (Cinclus cinclus) flying through waterfall, Bavaria, Germany. May.

Ingo Arndt / Aerial view of river bed amid sand dunes, Lencois Maranhenses National Park, Brazil. July, 2023.

Guy Edwardes / Dalmatian pelicans (Pelecanus crispus) flock, squabbling over food on lake, Lake Kerkini, Greece. January.

Emanuele Biggi / Common toad (Bufo bufo) male, resting on riverbed during breeding period, Viterbo, Italy.

Espen Bergersen / Red-throated diver (Gavia stellata) running across surface of lake, Svalbard, Norway. July

Andy Trowbridge / Eastern great egret (Ardea alba modesta) standing in shallow water with fish prey in beak, Lake McGregor, Canterbury, South Island, New Zealand.

Nick Garbutt / White-tailed eagle (Haliaeetus albicilla) in flight over Loch Na Keel, Isle of Mull, Scotland, UK. June.

Bret Charman / Platypus (Ornithorhynchus anatinus) swimming on surface of small lake, Tasmania, Australia.

Bret Charman / Torrent duck (Merganetta armata) male, standing on rock in the fast-flowing Rio Blanco river, Manizales, Colombia.

Bret Charman / African wild dog (Lycaon pictus) dragging a dead Impala (Aepyceros melampus) from a shallow pool at the edge of the Luangwa River, South Luangwa National Park, Zambia.

Bret Charman / African wild dog (Lycaon pictus) standing on banks of the Luangwa River, South Luangwa National Park, Zambia.

Bret Charman / African leopard (Panthera pardus) female juvenile, drinking at edge of waterhole, South Luangwa National Park, Zambia.

Bret Charman / Chital (Axis axis) pair with fawn, drinking at waterhole, Nagarhole National Park, Karnataka, India.

Bret Charman / Two Platypus (Ornithorhynchus anatinus) fighting at surface of small lake, Tasmania, Australia.

Bret Charman / Platypus (Ornithorhynchus anatinus) swimming across water surface in lake, Tasmania, Australia.

Bret Charman / Platypus (Ornithorhynchus anatinus) swimming on surface of lake, Tasmania, Australia.

Bret Charman / Red-crowned cranes (Grus japonensis) flock and three Sika deers (Cervus nippon) wading in river at sunrise in winter, Hokkaido, Japan. January.

Bret Charman / Platypus (Ornithorhynchus anatinus) swimming at surface of a creek, Eungella National Park, Queensland, Australia.

Andy Rouse / Tufted duck (Aythya fuligula) pair on lake in autumn, Forest of Dean, Gloucestershire, UK.

Joel Sartore / Photo Ark / Brilliant rasbora (Rasbora einthovenii) portrait, Nebraska Aquatic Supply. Captive, occurs in Southeast Asia and Indonesia.

Joel Sartore / Photo Ark / Brilliant rasbora (Rasbora einthovenii) portrait, Nebraska Aquatic Supply. Captive, occurs in Southeast Asia and Indonesia.

Alex Mustard / Diver swimming through the Silfra fissure, a crack in the Earth's crust between the North American and Eurasian continental plates, which is filled with glacial melt water, Thingvellir National P...

Alex Mustard / Fulmar (Fulmarus glacialis) soaring above a rainbow (waterfall-bow) created by the Skogafoss waterfall, Southern Iceland. April.

Ross Hoddinott / Emperor dragonfly (Anax imperator) female, ovipositing in pond surrounded by Damselflies, Cornwall, England, UK. July.

Ross Hoddinott / Emperor dragonfly (Anax imperator) female, ovipositing in pond, Cornwall, England, UK. July.

Ross Hoddinott / Emperor dragonfly (Anax imperator) female, ovipositing in pond surrounded by Damselflies, Cornwall, England, UK. July.

Ross Hoddinott / Emperor dragonfly (Anax imperator) female, ovipositing in pond surrounded by Damselflies, Cornwall, England, UK. July.

Ross Hoddinott / Emperor dragonfly (Anax imperator) female, ovipositing in pond, Cornwall, England, UK. July.

Ross Hoddinott / Emperor dragonfly (Anax imperator) female, ovipositing in pond surrounded by Damselflies, Cornwall, England, UK. July.

Niall Benvie / View of blanket bog and bog pools in winter, Forsinard, Sutherland, Scotland, UK. December, 2003.

Guy Edwardes / Snow-covered lake and mountains at sunset, Lago di Fusine, Julian Alps, Italy. February, 2023.

Guy Edwardes / Frozen lake and snow-covered mountains at sunset, Lago di Predil, Julian Alps, Italy. February, 2023.

Neil Aldridge / Hippopotamus (Hippopotamus amphibius) yawns in a waterhole at dusk, Okavango Delta, Botswana.

Neil Aldridge / Two Red lechwe (Kobus leche) females jumping over a small channel in a swamp, before leaving frame. Another Red lechwe is grazing alongside an African sacred ibis (Threskiornis aethiopicus) which is f...

David Tipling / Aerial view of RSPB Sharpham Drove Nature Reserve, Glastonbury, Somerset, England, UK, August. Site was an old peat extraction site now flooded.

Konrad Wothe / Dipper (Cinclus cinclus) flying out from nest behind waterfall, Upper Bavaria, Germany, May.

Konrad Wothe / Dipper (Cinclus cinclus) entering nest by flying through waterfall, Upper Bavaria, Germany, May.

Harry Collins / Brown bear (Ursus arctos) and cub walking across a shallow river, during Salmon (Salmonidae sp.) migration. A gull (Laridae sp.) is standing infront of the bears. Katmai National Park, Alaska. August.

Harry Collins / Brown bear (Ursus arctos) hunting Salmon (Salmonidae sp.) using the 'snorkeling' technique. The bear looks for fish by immersing its head in water. Katmai National Park, Alaska. August.

Harry Collins / Brown bear (Ursus arctos) hunting Salmon (Salmonidae sp.) using the 'snorkeling' technique. The bear looks for fish by immersing its head in water. Katmai National Park, Alaska. August.

Harry Collins / Brown bear (Ursus arctos) hunting Salmon (Salmonidae sp.) in a river. The bear chases after its prey but loses it, then the animal stands on its hind legs and looks around. Katmai National Park, Alask...

Harry Collins / Tracking shot of a Brown bear (Ursus arctos) walking along the water's edge, during Salmon (Salmonidae sp.) migration. In the background, three cubs are following. Katmai National Park, Alaska. August...

Brian Bevan / Great crested grebe (Podiceps cristatus) pair attempt to feed feather to chick resting on one parent's back as the other preens, Bedfordshire UK, April.

Brian Bevan / Great crested grebe (Podiceps cristatus) pair attempt to feed fish to chick resting on one parent's back, Bedfordshire UK, April.

Brian Bevan / Great crested grebe (Podiceps cristatus) pair attempt to feed fish to chick resting on one parent's back, Bedfordshire UK, April.

Harry Collins / Brown bear (Ursus arctos) mother and cub feeding on salmon. Cub pulls half of salmon apart and walks away, leaving frame. Second cub enters frame and walks towards mother, Katmai, Alaska, USA, August.

Harry Collins / Elk (Cervus canadensis) stag in rut bugling as it wades through Bow River, Banff National Park, Alberta, Canada, September.

Harry Collins / Tracking shot of Brown bear (Ursus arctos) mother catching Sockeye salmon (Oncorhynchus nerka) in river as cubs wait on riverbank, Katmai, Alaska, USA, August.

Harry Collins / Tracking shot of Brown bear (Ursus arctos) catching Sockeye salmon (Oncorhynchus nerka) for cubs, Katmai, Alaska, USA, August.

Harry Collins / Tracking shot of Brown bear (Ursus arctos) mother wading through river to catch Sockeye salmon (Oncorhynchus nerka) as her three cubs follow along riverbank, Katmai, Alaska, USA, August.

Harry Collins / Tracking shot of Brown bear (Ursus arctos) chasing salmon down river as a Gull (Larus sp.) flies past and another bear watches, Katmai, Alaska, USA, August.

Harry Collins / Tracking shot of Brown bear (Ursus arctos) male looking around and walking through river, Katmai, Alaska, USA, August.

Harry Collins / Tracking shot of Brown bear (Ursus arctos) mother carrying Sockeye salmon (Oncorhynchus nerka) as cub watches, Katmai, Alaksa, USA, August.

Harry Collins / Tracking shot of Brown bear (Ursus arctos) mother walking into river as cubs follow, Katmai, Alaska, USA, August.

Harry Collins / Brown bear (Ursus arctos) cub playing with a rock and licking paw whilst standing beside mother in river, Katmai, Alaska, USA, August.

Harry Collins / Tracking shot of Brown bear (Ursus arctos) catching a Sockeye salmon (Oncorhynchus nerka) and carrying it out of river, Katmai, Alaska, USA, August.

Wim van den Heever / Nile crocodile (Crocodylus niloticus) lying on riverbank with mouth open, Chobe River, Botswana.

Wim van den Heever / Malachite kingfisher (Corythornis cristatus) flying above Chobe River, Botswana.

Sven Zacek / Bog pool at sunrise, Meelva Nature Protection Area, Polvamaa county, Estonia.

Sven Zacek / Clouds moving over frozen Valaste Waterfall, Ida-Virumaa county, Estonia.

Ross Hoddinott / Keld waterfall, Swaledale, Yorkshire Dales National Park, Yorkshire, UK, October 2023.

Richard Flack / Red-billed Teal (Anas erythrorhyncha) flock in flight over lake, Elephant Marsh, Malawi, October.

Mark Carwardine / Long-tailed mayfly (Palingenia longicauda) in flight above water's surface, as others are flying nearby, River Tisza, Hungary, June.

Jack Dykinga / Aurora Borealis over Obed Lake and surrounding forest, Alberta, Canada, September.

John Cancalosi / Northern red-bellied turtle (Pseudemys rubriventris) hauling out of water onto log to bask, Maryland, USA.

George Sanker / American bison (Bison bison) bull drinking from mountain creek at dusk, Yellowstone National Park, Wyoming, USA, May.

Ann & Steve Toon / Black crake (Zapornia flavirostra) running along bank beside pool at sunrise, Zimanga game reserve, KwaZulu-Natal, South Africa, June.