Andrew Parkinson / Mute swan (Cygnus olor) cygnets with head submerged while feeding underwater, with mother watching and helping, Derbyshire, England, UK. June. Highly Commended in the Animal Behaviour category of the...

Tui De Roy / Marine iguana (Amblyrhynchus cristatus) submerged in salty pools to avoid mosquitoes, Santa Cruz Island, Galapagos.

David Pattyn / Black necked grebe (Podiceps nigricollis) adult bird spreading its wings and waiting for the submerged partner to appear in front and perform the courtship dance. This is early in the breeding season,...

Ingo Arndt / European edible frog half submerged in water {Rana esculenta} Germany

Chris Mattison / Budgett's Frog (Lepidobatrachus laevis) mostly submerged in muddy water, with eyes visible above water, captive, occurs in South America.

David Pattyn / Black necked grebe (Podiceps nigricollis) pair courting. One bird is waiting with the wings spread while the other one is submerged and approaching. The Netherlands.May 2014

David Pattyn / Black necked grebe (Podiceps nigricollis) adult spreading its wings during the courtship dance. This bird is waiting for the submerged partner to emerge from the water and perform a dance in front. Th...

Markus Varesvuo / Spotted Redshank (Tringa erythopus) foraging, with head submerged in water, Summer plumage Loviisa, Finland

Guy Edwardes / 2020VISION / Submerged weeds in the River Test, near Longstock, Hampshire, England, UK, May.

Andy Trowbridge / Grey Seal (Halichoerus grypus) at rest on submerged rock, head and one flipper above water. Shetland Islands, Scotland, UK. July.

Mark Taylor / Car park flooded by River Wey, with cars almost completely submerged during Christmas 2013 flooding, Guildford. Surrey, England, UK. 25th December 2013.

Bence Mate / Head portrait of young Spectacled caiman (Caiman crocodilus) partially submerged in water, with reflection, Santa Rita, Costa Rica

Will Watson / Group of men attempting to rescue a vehicle stuck in flood water, River Camerones, Manabi province Ecuador. February 2012. No release available.

Pete Oxford / American alligator (Alligator mississippiensis) half submerged, Okefenokee National Wildlife Refuge, Florida, USA

Anup Shah / Hippopotamus female and calf (Hippopotamus amphibius) head portraits, submerged in lily covered pool, Masai Mara National Reserve, Kenya. February

Anup Shah / Hippopotamus (Hippopotamus amphibius) mother and calf aged less than 1 month, partially submerged in water. Masai Mara National Reserve, Kenya. February.

Ann & Steve Toon / Head portrait of Nile crocodile (Crocodylus niloticus) partically submerged, Crocodile Centre, St Lucia, KwaZulu Natal, South Africa. Captive

Wild Wonders of Europe / Radisic / Photographer, Milan Radisics, submerged and camouflaged, in water of Lake Skadar, Lake Skadar National Park, Montenegro, May 2008, on location for Wild Wonders of Europe WWE BOOK PLATE. WWE OUTDOOR E...

Wild Wonders of Europe / Biancarelli / Fallen tree submerged in Gradinsko Lake and European beech (Fagus sylvatica) leaves, Upper Lakes, Plitvice Lakes National Park, Croatia, October 2008

Richard Herrmann / Research submersible submerging to explore hot vents, Danzante Island, Baja California, Mexico

Andy Rouse / Hippopotamus (Hippopotamus amphibius) partially submerged amongst lillies, South Africa (non-ex)

Edwin Giesbers / Nile crocodile (Crocodylus niloticus) partially submerged at night, captive, Madagascar

Jack Dykinga / Flowering Lobelia (Lobelia cardinalis) beside a pool with submerged Yellow pond lily (Nuphar polysepala) and Cypress (Taxodium sp) in El Cielo Biosphere Reserve, Tamaulipas, Mexico

Jose B. Ruiz / Black winged stilt {Himantopus himantopus} with head submerged, feeding in lake, Donana NP, Sevilla, Spain

Rolf Nussbaumer / American alligator submerged {Alligator mississipiensis} Sanibel Is, Florida, USA.

ZSSD / Hippopotamus (Hippopotamus amphibius) swimming submerged in tank, native to Africa

Tony Heald / Hippopotamus submerged, eyes and ears just above water.Kruger National Park, South Africa

Anup Shah / Head on view of male Indian gharial {Gavialis gangeticus} India, Endangered species

Phil Savoie / Landscape of Earthquake Lake, with submerged trees from Earthquake, Beaverhead National Forest, Madison Mountain Range, Montana, USA, July.

Sandesh Kadur / Bengal tiger (Panthera tigris) submerged in water. Ranthambore National Park, India.

Marie Read / Spotted sandpiper (Actitis macularius), with head submerged as it jabs at underwater prey, Caroline, New York, USA, May.

Marie Read / Eared grebe (Podiceps nigricollis), adult in breeding plumage, swimming amidst Water crowfoot flowers, (Ranunculus aquatilis) flowers, Benton Lake National Wildlife Refuge, Montana, USA, July.

Robin Chittenden / Oriental darter (Anhinga melanogaster) submerged in water, Sri Lanka.

Nick Upton / Blind albino cave crabs / Squat lobsters (Munidopsis polymorpha), a species endemic to Lanzarote, grazing on submerged rocks in a lava tube flooded with seawater, Jameos del Agua, Lanzarote, Canary Is...

Remi Masson / Great blue spotted mudskipper (Boleophthalmus pectinirostris) submerged with head above mud. Kyushu Island, Japan.

Shane Gross / Cuban crocodile (Crocodylus rhombifer) submerged in a cenote in Cienaga de Zapata National Park. Cuba. Critically endangered species.

Shane Gross / Cuban crocodile (Crocodylus rhombifer) submerged in a cenote in Cienaga de Zapata National Park. Cuba. Critically endangered species.

David Tipling / View across Cley Marshes from West Bank with Coastguards road sign submerged in flood waters, North Norfolk, England, UK. January 13th 2017.

David Tipling / View across Cley Marshes from West Bank with Coastguards road sign submerged in flood waters, North Norfolk, England, UK. January 13th 2017.

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Remi Masson / European beaver (Castor fiber) swimming under submerged branches outside of its lodge, knocks into camera, River Rhone, Rhone-Alpes, France, July.

Jan Hamrsky / Skimmer dragonfly nymph (Libellula depressa), crawling on a piece of submerged wood, Europe, June, controlled conditions

Jan Hamrsky / Skimmer dragonfly nymph (Libellula depressa), crawling on a piece of submerged wood, Europe, June, controlled conditions

Jan Hamrsky / Ramshorn snail (Planorbis planorbis), on piece of submerged wood, June, controlled conditions

Jan Hamrsky / Freshwater snail (Radix sp.), on submerged root, Europe, June, controlled conditions

Jan Hamrsky / Freshwater snail (Radix sp.), on submerged root, Europe, June, controlled conditions

Jan Hamrsky / Flathead mayfly nymph (Heptagenia flava), on piece of submerged wood, Europe, June, controlled conditions

Jan Hamrsky / Flathead mayfly nymph (Heptagenia flava), on piece of submerged wood, Europe, June, controlled conditions

Jan Hamrsky / Case-building caddisfly larva (Anabolia sp.), crawling on a submerged wood, Europe, June, controlled conditions

Jan Hamrsky / Case-building caddisfly larva (Anabolia sp.), crawling on a submerged wood, Europe, June, controlled conditions

Jan Hamrsky / Skimmer dragonfly nymph (Libellula depressa), crawling on a piece of submerged wood, Europe, June, controlled conditions

Ann & Steve Toon / African elephant (Loxodonta africana) submerged in Chobe river, Chobe National Park, Botswana.

David Fleetham / Large wave-energy buoy, partially submerged, in Honolulu Harbour before being towed to Kaneoho Bay, Oahu, Hawaii. The 40-kW experimental buoy employs the bobbing motion of the buoy to drive an electri...

Nick Upton / Glaucous glasswort (Arthrocnemum macrostachyum) bushes partly submerged by a high tide in a coastal lagoon, Sotavento, Fuerteventura, Canary Islands, May.

Nick Upton / Glaucous glasswort (Arthrocnemum macrostachyum) bushes partly submerged by a high tide in a coastal lagoon, Sotavento, Fuerteventura, Canary Islands, May.

Michel Roggo / African bush elephant (Loxodonta africana) wading through Zambezi River. Almost completely submerged apart from the top of head and tip of trunk. Upstream of the Victoria Falls at the border of Zimbab...

Michel Roggo / Submerged fallen tree, Aeroplane Lake, Northern Rockies, British Columbia, Canada August 2016 . Photographed for The Freshwater Project

Andy Trowbridge / Male and female Australasian shoveler (Anas rhynchotis) perched on submerged log in shallow water. Ashley River, Canterbury, New Zealand. July.

David Pattyn / Mallard (Anas platyrhynchos) two males with heads submerged dabbling in fen pond. De Regte Heide Nature reserve, Goirle, The Netherlands, June.

Roy Mangersnes / Marine iguana (Amblyrhynchus cristatus) trying to keep the mosquitos away by staying submerged in a pond, Santiago Island, Galapagos.

Steve Downer / Grey heron (Ardea cinerea) perched on a submerged branch during a rain storm, Birmingham, England, UK, July.

Tui De Roy / Santa Cruz Galapagos tortoise (Chelonoidis nigra porteri) partially submerged, Santa Cruz Highlands, Galapagos

Denis-Huot / Hippopotamus (Hippopotamus amphibius) calf on a riverbank with submerged adults in river during heavy rain, Masai-Mara Game Reserve, Kenya. April.

Nick Upton / View of the River Avon in spate, with partly submerged trees, Lacock, Wiltshire, England, UK, January 2013.

Nick Upton / View of the River Avon in spate, with partly submerged trees, Lacock, Wiltshire, England, UK, January 2013.

Nick Upton / View of the River Avon in spate, with partly submerged trees, Lacock, Wiltshire, England, UK, January 2013.

Nick Upton / View of the River Avon in spate, with partly submerged trees, Lacock, Wiltshire, England, UK, January 2013.

Nick Upton / View of the River Avon in spate, with partly submerged trees, Lacock, Wiltshire, England, UK, January 2013.

Nick Upton / View of the River Avon in spate, with partly submerged trees, Lacock, Wiltshire, England, UK, January 2013.

Nick Upton / View of the River Avon in spate at sunset, with partly submerged trees, Lacock, Wiltshire, England, UK, January 2013.

Mark Taylor / Submerged forest at Kaindy Lake with Schrenk's spruce (Picea schrenkiana) trees, Lake Kaindy, Kazakhstan. August 2016.

Mark Taylor / Submerged forest with Schrenk's spruce (Picea schrenkiana).at Lake Kaindy, Kazakhstan. August 2016.

Nick Upton / Willow trees (Salix sp.) fringing the River Avon partly submerged after weeks of heavy rain caused it to burst its banks, Lacock, Wiltshire, UK, February 2014.

Nick Upton / Willow trees (Salix sp.) fringing the River Avon partly submerged after weeks of heavy rain caused it to burst its banks, Lacock, Wiltshire, UK, February 2014.

Tony Heald / Nile crocodile (Crocodylus niloticus) head semi submerged in water, Chobe National Park Botswana.

Eric Baccega / Dead Mopane trees (Colophospermum mopane) partially submerged in Lake Kariba, Matusadona National Park, Zimbabwe

Eric Baccega / Dead Mopane trees (Colophospermum mopane) partially submerged in Lake Kariba at sunset, Matusadona National Park, Zimbabwe

Eric Baccega / Dead Mopane trees (Colophospermum mopane) partially submerged in Lake Kariba. Matusadona National Park, Zimbabwe

Denis-Huot / Two submerged Hippopotamuses (Hippopotamus amphibius) in heavy rain, Musiara Marsh, Masai Mara Game Reserve, Kenya.

Clay Bolt / Red salamander (Pseudotriton ruber) sits on a submerged tree trunk in a bog at sunset, South Carolina, USA, April.

Graham Eaton / Part of a submerged Holocene forest, revealed after a winter storm from beneath the sand at Hells Mouth (Porth Neigwl), Abersoch Wales, UK March 2014

Will Watson / Diving Beetle (Colymbetes fuscus) resting on submerged log, captive, Herefordshire, England.

Markus Varesvuo / Black stork (Ciconia nigra) beak submerged fishing, Hungary May

SCOTLAND: The Big Picture / Birch (Betula pendula) and Alder (Alnus glutinosa) woodland submerged under flood plain overflow, River Spey, Cairngorms National Park, Scotland, UK, December 2013.

SCOTLAND: The Big Picture / Birch (Betula pendula) and Alder (Alnus glutinosa) woodland submerged under flood plain overflow, River Spey, Cairngorms National Park, Scotland, UK, December 2013.

Tony Wu / A lone sponge perched on a ledge in the Eastern Fields, a submerged coral reef atoll in the Coral Sea of Papua New Guinea.