Marie Read / Snowy Owl (Nyctea scandiaca) female perched, Amherst Island, Ontario, Canada, January.

Marie Read / Loggerhead shrike (Lanius ludovicianus) on an ice-covered fence after an ice storm, Anahuac National Wildlife Refuge, Texas, USA. January.

Terry Whittaker / Red fox (Vulpes vulpes) adult with train in background, Kent, UK. March. Highly commended in the Nature Photographer of the Year Awards 2018. Taken with remote camera.

Juergen Freund / Tolga Bat Hospital director Jenny Maclean rescuing, Spectacled flying fox (Pteropus conspicillatus) caught in barbed wire fence. Atherton Tablelands, Queensland, Australia. April 2015. Second Place i...

Charlie Summers / Rocky mountain bighorn (Ovis canadensis) ram jumping a barbed wire fence, Montana, USA,

Shattil & Rozinski,Shattil & Rozinski / Black bear (Ursus americanus) cub climbing a fence, Minnesota, USA, May.

Fabrice Cahez / Eurasian Sparrowhawk (Accipiter nisus) rear view perching on fence post with tail feathers spread. Vosges, France, January.

Fabrice Cahez / Roe Deer (Capreolus capreolus) jumping over barbed wire fence in snow. Vosges, France, January.

Ross Hoddinott / Male house sparrow (Passer domesticus) on barbed wire fence, next to starlings (Sturnus vulgaris). Nr Bradworthy, Devon, UK, December

Charlie Summers / Rocky Mountain Bighorn sheep (Ovis canadensis) female jumping barbed wire fence, Montana, USA

Andy Sands / European Cuckoo (Cuculus canorus) female perched on fence post, Isle of Coll, Scotland, UK, June

Nick Garbutt / Polar Bear Cub (7-8 months) (Ursus maritimus) investigating photographer through wire fence. Lodge on the shores of Hudson Bay, Canada (Sept).

Nick Garbutt / Polar Bear Cubs (7-8 months) (Ursus maritimus) investigating photographer through wire fence. Lodge on the shores of Hudson Bay, Canada (Sept).

Marie Read / Snowy Owl (Nyctea scandiaca) female preparing to take flight from its perch on a fence, Barrie, Ontario, Canada. February.

Richard Du Toit / Savanah Monkey (Chlorocebus aethiops) balancing on barbed wire, Umlalazi Nature Reserve, KwaZulu-Natal, South Africa

Ingo Arndt / Guanaco (Lama guanicoe) dead after being caught in wire fence, Patagonia, Chile

Ashley Cooper / Nuclear reactor capped off after the fire of October 1957 at Sellafield nuclear power station near Seascale in West Cumbria, UK. February 2013

Ashley Cooper / Sellafield nuclear power station near Seascale, West Cumbria, UK. February 2013

Ashley Cooper / Security guards at one of the entrances to Sellafield nuclear power station near Seascale, West Cumbria, England, UK, February 2013

Ashley Cooper / Warning sign about the presence of Argentinian mines on the Falkands, February 2014.

Ashley Cooper / Warning sign about the presence of Argentinian mines on the Falkands, February 2014.

Joao Burini / Land surrounding Intervales State Park deforested for pasture, Sao Paulo, Brazil. April 2010.

Richard Du Toit / Dideric cuckoo (Chrysococcyx caprius) perched on fence, Overberg, Western Cape Province, South Africa.

Roger Powell / Corn bunting (Miliaria calandra) singing from a barbed wire fence. Alentejo, Portugal, March.

Roger Powell / Spanish sparrow (Passer hispaniolensis) male perched on a roadside barbed wire fence. Alentejo, Portugal.

Richard Du Toit / Black-winged Kite (Elanus caeruleus) taking flight, De Mond Nature Reserve, Western Cape, South Africa

Yva Momatiuk & John Eastcott / Guanaco (Lama guanicoe) carcass, caught in barbed wire fence, partially eaten by carnivores, Patagonia, Argentina

Yva Momatiuk & John Eastcott / Guanaco (Lama guanicoe) carcass, caught in barbed wire fence, partially eaten by carnivores, Patagonia, Argentina

Ann & Steve Toon / Siam rosewood tree (Dalbergia cochinchinensis), protected by fence and barbed wire, Thap Lan National Park, Dong Phayayen-Khao Yai Forest Complex, eastern Thailand, August.

Gabriel Rojo / Campo flicker (Colaptes campestris) calling from barbed wire fence, La Pampa, Argentina

Alastair MacEwen / Timelapse of frost forming on barbed wire, controlled conditions, Somerset, England, UK.

Ingo Arndt / Flying fox (Pteropus genus) caught on barbed wire fence, Queensland, Australia

Ingo Arndt / Flying fox (Pteropus genus) caught on barbed wire fence, Queensland, Australia

Ingo Arndt / Portrait of domesticated Ostrich (Strustio camelus) looking through wire fence, Germany

Ingo Arndt / Guanaco (Lama guanicoe), dead after being caught in wire fence, Patagonia, Chile

Ingo Arndt / Guanaco (Lama guanicoe), dead after being caught in wire fence, Patagonia, Chile

Terry Whittaker / Yellowhammer (Emberiza citrinella) perched on barbed wire fence. Chalk cliffs, Dover, Kent. July

Ann & Steve Toon / Dead moles (Talpa europea) hung up in a line on barbed wire. Durham, UK. May.

Gabriel Rojo / Dead Pampas fox (Lycalopex gymnocercus) Grey fox (Lycalopex culpaeus) and Geffroy's cat (Oncifelis geoffroyi) killed by sheep farmers and hung up to deter others, Patagonia, Argentina

Gabriel Rojo / Dead Pampas fox (Lycalopex gymnocercus) Grey fox (Lycalopex culpaeus) and Geffroy's cat (Oncifelis geoffroyi) killed by sheep farmers and hung up to deter others, Patagonia, Argentina

Roger Powell / Golden-headed cisticola (Cisticola exilis) singing over its breeding territory from a wire fence. Werribee, Victoria, Australia

Roger Powell / Crested pigeon (Ocyphaps lophotes). male courting female on a garden fence. Werribee, Victoria, Australia.

Terry Whittaker / Arctic terns (Sterna paradisaea) with house in background, Flatey Island, Breioafjorour, Iceland. July

Martin Willis / Little Red Flying Fox (Pteropus scapulatus) caught on barb-wired fence, Atherton, Queensland, Australia

Gabriel Rojo / Fork-tailed flycatcher (Tyrannus savana) sitting on wire fence in front of Domestic cow, La Pampa, Argentina

Niall Benvie / Plantation of Scots pine (Pinus sylvestris) saplings, surrounded by wire, Cairngorms National Park, Scotland, March.

Paul Hobson / Wren (Troglodytes troglodytes) singing on wire fence, Sheffield, England, UK, April.

Gerrit Vyn / Loggerhead shrike (Lanius ludovicianus) hunting from a fence post, Cameron Parrish, Louisiana, USA, December.

Juergen Freund / Spectacled flying fox (Pteropus conspicillatus) dead after getting trapped on barbed wire fence. Atherton Tablelands, Queensland, Australia. May. Second Place in the Man and Nature portfolio category...

Martin Willis / Fairy Martin (Hirundo ariel) trio perching on barbed wire, Woodstock, Queensland, Australia

Charlie Summers / Rocky mountain bighorn ewe (Ovis canadensis) jumping a barbed wire fence. Montana, USA.

Dong Lei / Eurasian cuckoo (Cuculus canorus) with caterpillar prey, on barbed wire fence, Serxu, Shiqu county, Sichuan Province, Qinghai-Tibet Plateau, China.

Loic Poidevin / European roller (Coracias garrulus) regurgitating pellet perched on barbed wire fence, Alentero, Spain, April.

Hanne & Jens Eriksen / Ortolan bunting (Emberiza hortulana) male perched, during migration, Oman, April.

Hanne & Jens Eriksen / Northern wheatear (Oenanthe oenanthe) male perched during migration, Oman, April.

Hanne & Jens Eriksen / Ortolan bunting (Emberiza hortulana) male perched, during migration, Oman, April.

Nick Garbutt / Juvenile Colombian Red-tailed Boa Constrictor (Boa constrictor constrictor) moving along a barbed wire fence. Unamas Reserve and Ranch, Los Llanos, Colombia, South America.

Nick Garbutt / Juvenile Colombian Red-tailed Boa Constrictor (Boa constrictor constrictor) moving along a barbed wire fence. Unamas Reserve and Ranch, Los Llanos, Colombia, South America.

Nick Garbutt / Juvenile Colombian Red-tailed Boa Constrictor (Boa constrictor constrictor) moving along a barbed wire fence. Unamas Reserve and Ranch, Los Llanos, Colombia, South America.

Juan Carlos Munoz / Sign showing man being chased by Ostrich (Struthio camelus) on wire fence, Vanrhynsdorp, Western Cape province, South Africa, September 2012.

Juan Carlos Munoz / Sign showing man being chased by Ostrich (Struthio camelus) on wire fence, Vanrhynsdorp, Western Cape province, South Africa, September 2012.

Luiz Claudio Marigo / Yellow-collared Macaws (Primolius auricollis) perched on wire fence, Cerrado, Caceres, Mato Grosso, Western Brazil

Markus Varesvuo / Dead Woodchat Shrike (Lanius senator) hanging from barbed wire fence, Spain

Donald M. Jones / Western Bluebird (Sialia mexicana) male and female on barbed wire, Montana

Peter Cairns / Redshank (Tringa totanus) perched on wire fence in field of Lupins, Iceland, June

Shattil & Rozinski / Dead Great horned owl (Bubo virginianus) caught on a barbed wire fence, Colorado, USA, September.

Glenn Bartley / Mountain Bluebird (Sialia currucoides) female carrying insect prey, Alberta, Canada

Nick Saunders / Tree Swallow (Tachycineta bicolor), Saskatchewan, Canada

Jacob S. Spendelow / Loggerhead Shrike (Lanius ludovicianus), Florida

E.J. Peiker / Scissor-tailed Flycatcher (Tyrannus forficatus), Texas

E.J. Peiker / Swainson's Hawk (Buteo swainsoni), Arizona

Roger Powell / Female Stonechat (Saxicola rubicola) collecting cattle hair from a wire fence to use as nesting material, Castro Verde, Alentejo, Portugal, April.

Roger Powell / Female Stonechat (Saxicola rubicola) collecting cattle hair from a wire fence to use as nesting material, Castro Verde, Alentejo, Portugal, April.

Tom Gilks / Wildlife poaching patrol unit on horseback remove a snare placed on the bottom of park boundary wire fence, Mount Kenya NP, Kenya

Tom Gilks / Wildlife poaching patrol unit on horseback remove a snare placed on the bottom of park boundary wire fence, Mount Kenya NP, Kenya

Nick Upton / Jackdaw (Corvus monedula) standing on a clifftop fence post with the sea in the background, Polzeath, Cornwall, UK, April.

Nick Upton / Jackdaw (Corvus monedula) standing on a clifftop fence post with the sea in the background, Polzeath, Cornwall, UK, April.

Nick Garbutt / Male Arabian Leopard (Panthera pardus nimr) seen through wire fencing at the Arabian Wildlife Centre & captive-breeding project, Sharjah, United Arab Emirates.

Nick Garbutt / Male Arabian Leopard (Panthera pardus nimr) seen through wire fencing at the Arabian Wildlife Centre & captive-breeding project, Sharjah, United Arab Emirates.

Fabrice Cahez / Wildcat (Felis silvestris) catching prey near barbed wire fence, Vosges, France, February

Ernie Janes / Pond Heron (Ardeola grayii) standing on wire fence, Sri Lanka

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) mother grooming her young among barbed wire, Thailand

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) mother with two young walking among barbed wire, Thailand

Benjamin Barthelemy / Barn swallow (Hirundo rustica) perched on a barbed wire fence, Lorraine, France, May.

Ernie Janes / Down Farm from the Ridgeway Long Distance Path at Ivinghoe Beacon, with Black bryony (Tamus communis) and Bramble (Rubus sp) growing round fence, both with berries. Buckinghamshire, UK, September

Andy Trowbridge / Yellow-eyed Penguin (Megadyptes antipodes) standing by a barbed wire stock fence. Katiki Point, Moeraki, Otago, South Island, New Zealand. January.

Luke Massey / 2020VISION / Turtle dove (Streptopelia turtur) perched on a barbed wire fence in a rain shower, Essex, England, UK, June.

Eric Medard / Common buzzard (Buteo buteo) flying over wire fence in winter, France, February

Eric Medard / Common buzzard (Buteo buteo) trapped on a barbed wire fence, France, July

Eric Medard / Common buzzard (Buteo buteo) trapped on a barbed wire fence, France, July

Eric Medard / Common buzzard (Buteo buteo) trapped in a barbed wire fence, France, July

David Tipling / 2020VISION / Skylark (Alauda arvensis) perched on fence post, Cambridgeshire Fens, UK, April

Markus Varesvuo / Two Turtle doves (Streptopelia turtur) on barbed wire fence, Israel, May

Martin Willis / Red-backed Fairywren (Malurus melanocephalus) female with insect, Atherton Tableland, Queensland, Australia

Martin Willis / Masked Finch (Poephila personata), Cumberland Dam, western Queensland, Australia