Lucas Bustamante / Scarlet Macaws (Ara macao) drinking water inside an Amazonian claylick. Yasuni National Park, Orellana, Ecuador

Ingo Arndt / Flock of Bramblings (Fringilla montifringilla) in flight, an estimated four million return to roost overwinter in Black Forest, Germany, March.

Tony Wu / Four Sperm whales (Physeter macrocephalus) rubbing their heads together while socializing, forming an X shape pattern. Caribbean.

Sam Hobson / Northern goshawk (Accipiter gentilis) nestlings inside treetop nest, handled by Dr. Norbert Kenntner. Part of an urban goshawk colour ringing study. Berlin, Germany, May 2014. Nominated in the Melvita...

Guy Edwardes / 2020VISION / Four-spotted chaser dragonfly (Libellula quadrimaculata) in rain, Westhay SWT reserve, Somerset Levels, England, UK, June. Photographer quote: 'Photographing in wet conditions can often result in inte...

Bryan and Cherry Alexander / Four Emperor penguin (Aptenodytes forsteri) chicks with an adult at Snow Hill Island colony. Antarctica, October.

Matthew Maran / Shadow of trained Indian elephant (Elephas maximus) carrying wildlife watchers, in green pool of water, with Barasingha / Swamp deer (Cervus duvaucel) Kaziranga National Park, Assam, India, November 2...

Kim Taylor / Water beetles (Dytiscus marginalis) and (Acilius sulcatus) clustered around an air bubble trapped beneath the ice of a frozen pond, digitally enhanced, Surrey, England

Pete Oxford / Chagras or cowboys on an overnight ride at a hacienda during the annual cattle round-up, with Mt Antisana in the background, Ecuador

Fred Bavendam / Australian Giant Cuttlefish (Sepia apama) hatchling swimming past the egg of an unhatched sibling after an incubation of about four months, southern Australia

Nigel Cattlin / Chickweed (Stellaria media) seedling with two cotyledons and two true leaves developing. Considered an agricultural weed.

Ashley Cooper / The Isle of Eigg off Scotland's west coast, shows the way forward to a renewable future. in 1997 the island was purchased from its fuedal landlord by the Eigg Heritage Trust, a partnership between the...

Ashley Cooper / The Isle of Eigg off Scotland's west coast, shows the way forward to a renewable future. in 1997 the island was purchased from its fuedal landlord by the Eigg Heritage Trust, a partnership between the...

Ashley Cooper / Four wind turbines beneath An Sgurr, Isle of Eigg. Isle of Eigg produces all the energy the island needs from renewable energy. Eigg, Scotland, UK, May.

Ashley Cooper / The Kern River oilfield in Oildale, Bakersfield, California, USA. Following an unprecedented four year long drought, Bakersfield is now the driest city in the USA, driven by climate change. September...

Ashley Cooper / Drought killed trees in Bakersfield, California, USA. Following an unprecedented four year long drought, Bakersfield is now the driest city in the USA. September 2014.

Ashley Cooper / Drought parched ranch in Bakersfield, California, USA. Following an unprecedented four year long drought, Bakersfield is now the driest city in the USA. September 2014.

Steve Downer / Four Canada geese (Branta canadensis) goslings swimming near to an adult, Birmingham, England, UK, May.

Paul D Stewart / Four tools of the mesolithic / neolithic period made from Red deer antlers. Dates range from approximately 5000 - 2000 BC. From left (and top) an antler mining pick retrieved from a British flint min...

Cyril Ruoso / European mouflon (Ovis gmelini musimon) four rams grazing, an introduced species in Baie de Nature Somme Reserve, France, April 2015

Alex Hyde / Four-spot Orb Weaver Spider male (Araneus quadratus) at edge of female's web, waiting for an opportunity ot mate. The male's pedipalps (commonly shortened to palps or palpi) that are used to transfer...

Alex Hyde / Four-spot orb weaver spider male (Araneus quadratus) at edge of female's web, waiting for an opportunity to mate. Peak District National Park, Derbyshire, UK. October.

Rebecca Robinson / Illustration of the diving and breaching behaviour of an Arnoux's beaked whale (Berardius arnuxii).

Kirkendall-Spring / Photographers silhouetted at sunrise on Steptoe Butte, Steptoe Butte State Park, Whitman County, Washington, USA, June 2014.

Kirkendall-Spring / Photographers lined up at sunrise on Steptoe Butte, Steptoe Butte State Park, Whitman County, Washington, USA, June 2014.

Frederique Olivier / Four Emperor penguin (Aptenodytes forsteri) chicks following an adult, Antarctica, September.

Brent Stephenson / A spring of Grey teal (Anas gracilis) perching on a log on the edge of a pond. Included in the photo are from left to right, a juvenile, an adult, and two immatures. Te Awanga Lagoon, Hawkes Bay, New...

Jussi Murtosaari / Peacock butterfly (Inachis io) with an ant, Finland, July.

Pal Hermansen / Northern Wall Brown (Lasiommata petropolitana) resting on an old abandoned car in a 'car graveyard', Bastnas, Sweden. June

Laurent Geslin / Mallard ducks (Anas platyrhynchos) flying close to an electricity pylon in London, UK

Hiroya Minakuchi / Pacific Sea Nettle (Chrysaora fuscescens) group in an aquarium

Andrew Parkinson / Gannet (Morus bassanus) adults and a youngster silhouetted against an orange red sky as another adult prepares to land. Shetland Islands, Scotland, UK. September

Donald M. Jones / Yucatan Jay (Cyanocorax yucatanicus) group, Sian Ka'an Biosphere Reserve, Mexico

Nick Upton / 2020VISION / Nigel Jarrett, Aviculture manager, inspects developing Common / Eurasian crane eggs (Grus grus) in an egg-turning incubator, WWT Slimbridge, Gloucestershire, England, UK, May 2009. 2020VISION Exhibiti...

Roland Seitre / Breeding project of the Hermit / Northern bald ibis (Geroniticus eremita) at the Jerez de la Frontera Zoo, Cadiz, Spain. Keepers wear ibis helmets to limit human imprint and enable the birds to recogn...

Toby Roxburgh / Annie Januszewski and Mel King with their original crew, training to row across the Atlantic in the WoodVale Challenge. Bristol Floating Harbour during the Harbour Festival, UK, August 2009. ^^^The te...

Andrew Parkinson / 2020VISION / An adult Coot (Fulica atra) surrounded by three chicks in the rain, Derbyshire, England, UK, June 2010

Sandesh Kadur / Women of the Bodo community walking across an old wooden bridge on a hot pre-monsoon afternoon in the foothills of the Bhutan Himalayas, Assam, India, September 2009

Nick Upton / 2020VISION / Four juvenile Common / Eurasian cranes (Grus grus) released by the Great Crane Project onto the Somerset Levels and Moors, foraging near an adult crane decoy, with Autumn Hawkbit (Leontodon autumnalis...

Pete Oxford / Magnificent Frigatebird (Fregata magnificens) silhouetted in flight. Sian Ka'an Biosphere Reserve, Quintana Roo, Yucat‡n Peninsula, Mexico.

Alex Mustard / An Atlantic spotted dolphin (Stenella frontalis) rejoins its pod over a shallow sand bank. Sandy Ridge, Little Bahama Bank, Bahamas. Tropical West Atlantic Ocean.

Pete Oxford / Stable Fly (Philornis downsi) research, an introduced species that is highly aggressive and damaging to young birds, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador

Pete Oxford / Stable Fly (Philornis downsi) research, an introduced species that is highly aggressive and damaging to young birds, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador

Juergen Freund / Julian Caley and Shawn Smith install an artificial reef as part of CReefs four year project to check what life form will inhabit this structure, Coral Life census, Lizard Island, Queensland, Australia...

Sue Flood / Emperor penguin (Aptenodytes forsteri) four chicks and an adult, Snow Hill Island rookery, Antarctica, November

Anup Shah / Gelada baboon (Theropithecus gelada) infants taking on an older juvenile, Simien Mountains National Park, Ethiopia, November

Mark Moffett / Driver Ant (Dorylus sp) workers investigating a termite fungus garden presented to them in an experiment in Gashaka, Nigeria

Kerstin Hinze / Spotted scats ( Scatophagus argus) in an aquarium

Flip Nicklin / Orca (Orcinus orca) pod in front of an ocean liner, southeast Alaska

Gerry Ellis / African Elephant (Loxodonta africana) orphans meeting Imenti, an older male orphan, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Gerry Ellis / African Elephant (Loxodonta africana) young orphans explore Imenti, an older male orphan, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Paul D Stewart / Falklands Wolf (Dusicyon australis). 1778 'The Wolf Fox of Faulklands Islands', a copperplate engraving from Commodore Byron's 'An account of a Voyage Round the World'. The Falkland Islands Wolf, Dusi...

Paul D Stewart / Illustration 'Of the Tiger' (Panthera tigris) a 1607 engraving with later tinting from Edward Topsell's 'History of four Footed Beasts'. Topsell produced one of the first printed English Bestiaries, c...

Paul D Stewart / Illustration of Indian Elephant (Elephas maximus) 'Of the Elephant' a 1607 engraving with later tinting from Edward Topsell's 'History of four Footed Beasts'. Topsell produced one of the first English...

Rick Tomlinson / Four times Whitbread sailor and mountaineer, Skip Novak, climbing through an ice cave in Antarctica.

Rick Tomlinson / Kariba Dam, Zimbabwe is located approximately halfway down the Zambezi River. The dam was surrounded by controversy, both environmentally and socially, it is an impressive monument to man's engineerin...

Premaphotos / Four Flesh flies (Sarcophaga carnaria) and a Noonday fly (Mesembrina meridiana) (top) and on an over-ripe plum, UK

Premaphotos / Four-spot orb weaver spider (Araneus quadratus) male (right) cohabiting in the lair of an immature female, UK

Suzi Eszterhas / Polar Bear (Ursus maritimus) researcher Nick Lunn holds three to four month old cub by the scruff while administering an anesthetic, vulnerable, Wapusk National Park, Manitoba, Canada

Gerry Ellis / African Elephant (Loxodonta africana) orphan called Edie taking an afternoon nap, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Gerry Ellis / African Elephant (Loxodonta africana) young orphans explore Imenti, an old male orphan, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Marie Read / Red-legged kittiwakes (Rissa brevirostris) pair defending their nest from an intruder, with parent mantling over chick for protection, St. Paul, Pribilof Islands, Alaska, USA. August.

Roman Willi / Three Mites (Balaustium sp.) attacking an Aphid (Aphididae), Lucerne, Switzerland. May. Focus stacked.

Nick Garbutt / Four tourists photographing Puma (Puma concolor) female, with cub, aged nine months, feeding on Guanaco (Lama guanicoe) carcass, Torres del Paine National Park / Estancia Laguna Armarga, Patagonia, Ch...

Charlie Hamilton-James / Four female park rangers on patrol, part of an all female ranger patrol, Gorongosa National Park, Mozambique. June, 2018.

Charlie Hamilton-James / Four female park rangers on patrol, part of an all female ranger patrol, Gorongosa National Park, Mozambique. June, 2018.

Charlie Hamilton-James / Four female park rangers on patrol, part of an all female ranger patrol, Gorongosa National Park, Mozambique. June, 2018.

Nick Upton / Two pairs of Bewick's swans (Cygnus columbianus bewickii) calling and wing flapping in an aggressive encounter on flooded pastureland, Gloucestershire, UK. November.

Joel Sartore / Photo Ark / Studio shot of four juvenile small-spotted catsharks (Scyliorhinus canicula) resting on top of an egg case with embryo inside, the embryo moving causes the young to swim away, Vasco da Gama Aquarium....

Nick Upton / White stork (Ciconia ciconia) with three chicks in nest at top of an Oak tree, gaping in hot sunshine with one exercising its wings, Knepp Estate, Sussex, UK, June.

Oriol Alamany / A Nepalese family, flanked by their two Tibetan mastiff dogs, walks along path through the Rhododendron forests at an alttude of 3,000 metres on their way to the village of Ghorepani, during the monso...

Alex Mustard / Group of Longfin batfish (Platax teira) beneath the surface, close to an island. Farondi Islands, Misool, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean.

Nigel Cattlin / Black nightshade plant (Solanum nigrum) young plant of an annual arable weed with cotyledons and four true leaves, Berkshire, July

Matthew Maran / Red fox vixen (Vulpes vulpes) grooming a suckling cub in an allotment, London, England, UK, May.

Matthew Maran / Red fox vixen (Vulpes vulpes) with four suckling cubs in an allotment, one jumping over her back, London, England, UK, May.

Matthew Maran / Red fox vixen (Vulpes vulpes) with four suckling cubs in an allotment, cubs start to play, London, England, UK, May.

Frederique Olivier / Crabeater seals (Lobodon carcinophagus) on an ice floe, Antarctica.

Nigel Cattlin / Attractive flowers on a Lilac (Syringa vulgaris) on an ornamental garden tree in full bloom, Berkshire, England, UK. April

Andy Sands / Curlew (Numenius arquata) nest with four eggs on recently burnt heather strip - this is the usual nest site on a working Grouse Moor, a recent decision to ban strip burning on deep peat will have an a...

Andy Sands / Curlew (Numenius arquata) nest with four eggs on recently burnt heather strip - this is the usual nest site on a working Grouse Moor, a recent decision to ban strip burning on deep peat will have an a...

Nayan Khanolkar / Tigress (Panthera tigris tigris) with her four cubs from Chandrapur district, Maharashtra, India. She lives in an area known for human-animal conflict and yet is successfully raising her four cubs in...