Alan Williams / View of dam at the south end of the Claerwen reservoir in the Elan Valley, near Rhayader, Powys, Wales, UK. November, 2022.

Oliver Hellowell / Mountain stream flowing down mountainside, Glencoe, Scotland, UK. October, 2022.

Oliver Hellowell / Maple tree (Acer sp.) with autumnal foliage overhanging pond, Glencoe Lochan, Glencoe, Scotland, UK October.

Jack Dykinga / Magellan's beech tree (Nothofagus betuloides) clinging to the cliffs above El Salto Grande, where the glacial waters from Lago Nordenskjold pour into Lago Pehoe, Torres del Paine National Park, C...

Jack Dykinga / Turquoise waters of the Little Colorado River near its confluence with Colorado River in the Grand Canyon with dawn light on Chuar Butte, Grand Canyon National Park, Arizona, USA. May, 2014.

Jack Dykinga / Sandhill crane (Grus canadensis) with Gopher (Geomyida) prey in beak, surrounded by flock of Snow geese (Anser caerulescens) among corn field stubble, Bosque del Apache Refuge, New Mexico, USA. Novemb...

Jack Dykinga / Sandhill crane (Grus Canadensis) taking flight from ice-covered pond, Bosque del Apache National Wildlife Refuge, New Mexico, USA. January.

Jack Dykinga / Common dolphin (Delphinus delphis) swimming at sea surface, near Isla Animas, Baja California Sur, Sea of Cortez, Mexico.

Jack Dykinga / Common dolphin (Delphinus delphis) pod swimming close to sea surface, near Isla Animas, Baja California Sur, Sea of Cortez, Mexico.

Jack Dykinga / Common dolphins (Delphinus delphis) porpoising, Isla Animas, Baja California Sur, Sea of Cortez, Mexico.

Jack Dykinga / Greater flamingo (Phoenicopterus ruber) taking flight from river, Ria Celestun Biosphere Reserve, Yucatan state, Mexico.

Jack Dykinga / Greater flamingo (Phoenicopterus ruber) taking flight from river, Ria Celestun Biosphere Reserve, Yucatan state, Mexico.

Jack Dykinga / Glowing lava entering the Pacific Ocean causing eruptions of steam as surf collides with molten rock, Volcanoes National Park, Hawaii. August, 2010.

Jack Dykinga / Glowing lava entering the Pacific Ocean causing eruptions of steam as surf collides with molten rock, Volcanoes National Park, Hawaii. August, 2010.

Jack Dykinga / Glowing lava entering the Pacific Ocean causing eruptions of steam as surf collides with molten rock, Volcanoes National Park, Hawaii. August, 2010.

Jack Dykinga / Glowing lava entering the Pacific Ocean causing eruptions of steam as surf collides with molten rock, Volcanoes National Park, Hawaii. August, 2010.

Jack Dykinga / Glowing lava entering the Pacific Ocean causing eruptions of steam as surf collides with molten rock, Volcanoes National Park, Hawaii. August, 2010.

Jack Dykinga / Glowing lava entering the Pacific Ocean causing eruptions of steam as surf collides with molten rock, Volcanoes National Park, Hawaii. August, 2010.

Jack Dykinga / Glowing lava entering the Pacific Ocean causing eruptions of steam as surf collides with molten rock, Volcanoes National Park, Hawaii. August, 2010.

Jack Dykinga / The "Racetrack", a dry lake bed where rocks are blown leaving tracks, given proper conditions of freezing and moisture combined with strong desert winds, Death Valley National Park, California, USA.

Tim Laman / Little blue heron (Egretta caerulea) juvenile, perched among a wall of Red mangroves (Rhizophora mangle) in early morning light, at the edge of a lagoon in Caroni Swamp, Trinidad and Tobago.

TOM MANGELSEN / Antarctic fur seal (Arctocephalus gazella) and King penguin (Aptenodytes patagonicus) squabbling, face to face, on beach, Salisbury Plain, South Georgia, South Atlantic Ocean.

Sergio Hanquet / Pink whipray (Pateobatis fai) swimming in open ocean, Male Atoll. Maldives, Indian Ocean.

Sergio Hanquet / Two Nurse sharks (Nebrius ferrugineus) swimming over coral reef and seabed, Maldives, Indian Ocean.

Sergio Hanquet / Giant guitarfish (Rhynchobatus djiddensis) resting on seabed, Male Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Longfin batfish (Platax teira) head portrait, Maldives, Indian Ocean.

Sergio Hanquet / Pennant coralfish (Heniochus acuminatus) shoal, Maldives, Indian Ocean.

Sergio Hanquet / Yellowmargin moray (Gymnothorax flavimarginatus) resting on coral reef, Maldives, Indian Ocean.

Sergio Hanquet / Machafushi shipwreck creating an artificial reef on seabed, with diver's lights in background, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Necklace starfish (Fromia monilis) portrait, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Necklace starfish (Fromia monilis) resting on coral reef, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Granulated sea star (Choriaster granulatus) resting on coral reef, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Green barrel sea squirts (Didemnum molle) on coral reef, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Stony cup coral (Dendrophyllia sp.) surrounded by various reef fish on coral reef, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Giant clam (Tridacna gigas) on coral reef with shoal of fish swimming by in background, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Palythoa covered coral reef and various species of reef fish, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Gorgonian fan coral (Subergorgia mollis) on coral reef, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Coral reef scene, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / Anemone (Heteractis magnifica) on a coral reef, Ari Atoll, Maldives, Indian Ocean.

Sergio Hanquet / RF - Nurse shark (Nebrius ferrugineus) resting on seabed at night, Maldives, Indian Ocean. (This image may be licensed either as rights managed or royalty free.)

Sergio Hanquet / RF - Coral reef scene, Ari Atoll, Maldives, Indian Ocean. (This image may be licensed either as rights managed or royalty free.)

Sergio Hanquet / RF - Yellowtail clownfish (Amphiprion clarkii) sheltering in its Sea anemone (Actiniaria), Maldives, Indian Ocean. (This image may be licensed either as rights managed or royalty free.)

Sergio Hanquet / RF - Yellowmargin moray (Gymnothorax flavimarginatus) with mouth open displaying aggression, Maldives, Indian Ocean. (This image may be licensed either as rights managed or royalty free.)

Sergio Hanquet / RF - Coral grouper (Cephalopholis urodeta) portrait, Maldives, Indian Ocean. (This image may be licensed either as rights managed or royalty free.)

Sergio Hanquet / RF - Necklace starfish (Fromia monilis) on coral reef, Ari Atoll, Maldives, Indian Ocean. (This image may be licensed either as rights managed or royalty free.)

Sergio Hanquet / RF - Coral reef scene, Ari Atoll, Maldives, Indian Ocean. (This image may be licensed either as rights managed or royalty free.)

Alan Williams / View looking south east towards the Pen-y- garreg reservoir in the Elan Valley in autumn, near Rhayader, Powys, Wales, UK. November, 2022.

Alan Williams / Stone road bridge across Caban-coch Reservoir, Elan Valley, Powys, Wales, UK. November, 2022.

Alan Williams / Footpath along the Shropshire Union Canal under the M53 motorway, Ellesmere Port, Cheshire, UK. October, 2022.

Joel Sartore / Photo Ark / Water anole (Anolis aquaticus) head portrait, from the wild, La Libia, Costa Rica.

Joel Sartore / Photo Ark / Water anole (Anolis aquaticus) portrait, from the wild, La Libia, Costa Rica.

Joel Sartore / Photo Ark / Burmese black turtle (Melanochelys trijuga edeniana) underwater, portrait, Turtle Survival Center. Captive, occurs in Myanmar.

John Cancalosi / American toad (Anaxyrus americanus) male sitting on a rock and displaying, showing vocal sac. The animal leaves the frame. Maryland, USA.

Jacob Guy / Nudibranch (Hypselodoris infucata) feeding on soft coral, Lembeh Strait, Indonesia.

Jacob Guy / Pygmy squid (Idiosepius pygmaeus) resting on plant, Lembeh Strait, Indonesia.

Jacob Guy / Close up of Pink-eared mantis shrimp (Odontodactylus latirostris) cleaning itself, Lembeh Strait, Indonesia.

Jacob Guy / Pink-eared mantis shrimp (Odontodactylus latirostris) cleaning itself, Lembeh Strait, Indonesia.

Jacob Guy / Pink-eared mantis shrimp (Odontodactylus latirostris) cleaning itself. After cleaning, the animal looks around. Lembeh Strait, Indonesia.

Jacob Guy / Common seahorse (Hippocampus sp.) using its prehensile tail to hold onto the coral in a current, Lembeh Strait, Indonesia.

Jacob Guy / Peacock mantis shrimp (Odontodactylus scyllarus) in defensive posture, looking around, Lembeh Strait, Indoensia.

Jacob Guy / Nudibranch (Glossodoris cincta) moving across rock, Lembeh Strait, Indonesia.

Jacob Guy / Nudibranch (Chromodoris kuniei) eating soft coral, Lembeh Strait, Indonesia.

Jacob Guy / Tracking shot of a pregnant Common seahorse (Hippocampus sp.) swimming along the seabed, Lembeh Strait, Indonesia.

Jacob Guy / Blackfin snake eel (Ophichthus altipennis) head above sand. The animal is waiting for prey to pass over. The rest of its body is buried beneath the sand. Lembeh Strait, Indonesia.

Jacob Guy / Close up of Thorny seahorse (Hippocampus histrix) head. The eyes of the animal can be seen moving as it looks around. Lembeh Strait, Indonesia.

Jacob Guy / Close up of Hairy shrimp (Phycocaris simulans) eating. Then the animal walks further down the vegetation. Lembeh Strait, Indonesia.

Jacob Guy / Close up of Hairy shrimp (Phycocaris simulans) eating, Lembeh Strait, Indonesia.

Jacob Guy / Close up of Hairy frogfish (Antennarius striatus) crawling along the sandy seabed, Lembeh Strait, Indonesia.

Jacob Guy / Close up of Coconut octopus (Amphioctopus marginatus) leaving the frame and retreating beneath a plactic cup, Lembeh Strait, Indonesia.

Jacob Guy / Lemon goby (Gobiodon citrinus) using bottle as a home. The fish swims towards the top of the bottle. Lembeh Strait, Indonesia.

Jacob Guy / Close up of Ornate ghost pipefish (Solenostomus paradoxus) courting, Lembeh Strait, Indonesia.

Jacob Guy / Close up of Ornate ghost pipefish (Solenostomus paradoxus) pair courting. The male swims round the female. Lembeh Strait, Indonesia.

Jacob Guy / Clown fish (Amphiprion sp.) swimming in Carpet anemone (Stichodactyla gigantea), Lembeh Strait, Indonesia.

Jacob Guy / Hairy frogfish (Antennarius striatus) opening its mouth. The animal is sitting on a sandy seabed. Lembeh Strait, Indonesia.

Jacob Guy / Close up of Hispid frogfish (Antennarius hispidus) resting, Lembeh Strait, Indonesia.

Jacob Guy / Hairy frogfish (Antennarius striatus) resting on sandy seabed, Lembeh Strait, Indonesia.

Jacob Guy / Close up of Coconut octopus (Amphioctopus marginatus) hiding under a plastic cup, Lembeh Strait, Indonesia.

Jacob Guy / Coconut octopus (Amphioctopus marginatus) breathing. The animal is hiding under a plastic cup. Lembeh Strait, Indonesia.

Neil Aldridge / African lion (Panthera leo) wading through water, meeting another lion on the bank. The two lions bound towards each other, playing, eventually disappearing into the long grass. Khwai, Okavango Delta,...

Neil Aldridge / African lion (Panthera leo) stalking through water, Khwai, Okavango Delta, Botswana.

Neil Aldridge / African lion (Panthera leo) male drinking from a water channel before looking up and walking a short distance, Okavango Delta, Botswana.

Neil Aldridge / African lion (Panthera leo) female drinking from a water channel before looking up, Okavango Delta, Botswana.

Neil Aldridge / African lion (Panthera leo) female leaping across a water channel out of the frame, Okavango Delta, Botswana.

Neil Aldridge / African lion (Panthera leo) female drinking from a water channel with African jacanas (Actophilornis africanus) feeding around the lion. The animal stops drinking and then looks up and observes its su...

Neil Aldridge / Tracking shot of African lion (Panthera leo) juvenile male walking near the water's edge, Okavango Delta, Botswana.

Neil Aldridge / Close up of African lion (Panthera leo) male drinking from a water channel. The animal stops and looks up, and its head leaves the frame. Okavango Delta, Botswana.

Roger Powell / Common chiffchaff (Phylloscopus collybita) perched on a reed stem over water, Riet Vell Reserve, Ebro Delta Reserve, Catalonia, Spain. January.

David Pike / Curve-billed thrasher (Toxostoma curvirostre) standing at edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / White tipped dove (Leptotila verreaux) walking along edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Curve-billed thrasher (Toxostoma curvirostre) drinking at edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Northern cardinal (Cardinalis cardinalis) male, standing at edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

David Pike / Northern cardinal (Cardinalis cardinalis) female, drinking at edge of pool, Santa Clara Ranch, near Edinburg, Texas, USA. January.

Roger Powell / Western marsh harrier (Circus aeruginosus) female, hunting in reed beds, Riet Vell Reserve, Ebro Delta Reserve, Catalonia, Spain. January.

Roger Powell / Western marsh harrier (Circus aeruginosus) female, hunting in reed beds, Riet Vell Reserve, Ebro Delta Reserve, Catalonia, Spain. January.

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

Roger Powell / Greater flamingo (Phoenicopterus roseus) male, wading in shallow water at dawn, La Tancada, Ebro Delta Reserve, Catalonia, Spain. January.