Brent Stephenson / Group of Racing pigeons (Columba livia) flying during a training flight near their loft, Redbrook, Monmouthshire, Wales, UK, August.

Claudio Contreras / Pigeon (Columba livia domestica) Trafalgar Square, London, UK. October

Constantinos Petrinos / Tomb of the Unknown Soldier with Feral pigeons (Columba livia) sitting on the monument located in Parliament Square (Syntagma Square) Attica region, Athens, Greece, Mediterranean, September 2013

Martin Willis / White-quilled Rock-Pigeon (Petrophassa albipennis), Mitchell Plateau, Kimberley, Western Australia, Australia

Dong Lei / Hill pigeon (Columba rupestris) pair perched on rock, Sichuan Province, China, July.

Nick Upton / Grey squirrel (Sciurus carolinensis) sitting on park bench feeding on Almonds given to it by tourist, with Carrion crows (Corvus corone) and Feral pigeon (Columba livia) and people walking in the ba...

Nick Upton / Two female tourists feeding Grey squirrel (Sciurus carolinensis) by hand, watched by Feral pigeons (Columba livia) St.James's Park, London, UK, September 2014.

Michel Poinsignon / Pigeon feathers plucked by an eagle owl (Bubo bubo) from its prey on a rock in a forest, Luxembourg. March.

Brent Stephenson / Feral pigeon (Columba livia) walking on short grass, with neck puffed up and iridescent in the sunshine. Visby, Gotland Island, Sweden. June.

Thomas Harbig / Peregrine Falcon (Falco peregrinus) female feeding on Rock Dove (Columba livia) prey, Saxony, Germany

Thomas Harbig / Peregrine Falcon (Falco peregrinus) female feeding on Rock Dove (Columba livia) prey during snowfall, Saxony, Germany

Alex Hyde / Rock Dove / Feral Pigeon (Columba livia) nesting in building. Portsmouth, UK, July.

Robin Chittenden / Turtle dove (Streptopelia turtur) on rock, Lesbos, Greece, May.

Mark Taylor / White dove walking on pink background.

Mark Taylor / Two white doves on pink background looking at each other.

Axel Gomille / Villager putting food out for Demoiselle cranes with pigeons arriving first. Rajasthan, India. February 2012.

Sam Hobson / Feral pigeons (Columba livia) outside the Houses of Parliament in Westminster. London, UK. July. Runner up in 2013 Terre Sauvage Nature's Images awards, Urban category.

Ernie Janes / Feral pigeon (Columba livia) on the West front of Wells Cathedral, Somerset, UK, April.

Ernie Janes / Feral pigeon (Columba livia) on the West front of Wells Cathedral, Somerset, UK, April.

Ernie Janes / Feral pigeon (Columba livia) on the West front of Wells Cathedral, Somerset, UK, April.

Ernie Janes / Feral pigeon (Columba livia) on the West front of Wells Cathedral, Somerset, UK, April.

Bernard Castelein / Oriental turtle dove (Streptopelia orientalis), near Zemitang, Arunchal Pradesh, India.

David Tipling / Wood pigeon (Columba palumbus), Norfolk, February.

Markus Varesvuo / Rock dove / Feral Pigeon (Columba livia) Helsinki Finland December

Markus Varesvuo / Rock dove / Feral Pigeon (Columba livia) pair mating, Helsinki Finland December

Markus Varesvuo / Rock dove / Feral Pigeon (Columba livia), pair, Helsinki Finland, December

Markus Varesvuo / Rock dove / Feral Pigeon (Columba livia) two birds interacting, Helsinki Finland December

Erlend Haarberg / Sparrowhawk (Accipiter nisus) catching a Rock dove (Columba livia) Jakobsli, Sor-Trondelag, Norway, March.

Roy Mangersnes / Bonelli's eagle (Aquila fasciata) feeding on a pigeon, Lleida, Catalonia, Spain, April.

Brent Stephenson / Feral pigeon (Columba livia) perched on a rock in the sun. Western Springs Park, Auckland, New Zealand, February.

Pat Tuson / Feral pigeon (Columba livia) on chain link fence, Central London, England, UK, November.

David Tipling / Feral pigeons (Columba livia) on pavement, with cars and taxis, New York City, USA, May.

Alan Williams / Domestic pigeons (Columba livia) flock in flight over town, Cheshire, UK, June.

Alan Williams / Domestic pigeons (Columia livia) flock in flight over houses, Cheshire, UK, June.

Alan Williams / Domestic pigeons (Columba livia) flock in flight over houses, Cheshire, UK, June.

Robin Chittenden / Feral pigeon / Rock dove (Columba livia) perched on wall, Norwich Cathedral, Norwich, Norfolk, UK, June.

Hans Glader / Rock Dove (Columba livia), Spain

Shattil & Rozinski / Rock pigeons (Columba livia) perched on a rock face overlooking Purgatoire River Canyon, Colorado, USA, July.

Will Watson / Feral Pigeons (Columbia livia) drinking from minature trough below a hydrant in the Market Square at Krakow, Poland, July.

Jan Wegener / Rock Dove (Columba livia), Berlin, Germany

Kim Taylor / Homing Pigeon (Columba livia) resting on a breakwater. Sussex, England

Kim Taylor / Garden Fantail Pigeon (Columba livia) walking along the ground, Surrey, England

Nick Upton / Feral pigeon / Rock Dove (Columba livia) perched on a ledge on a coastal cliff, Cornwall, UK, April.

Nick Upton / Four Feral pigeons / Rock Doves (Columba livia) including two lost Racing pigeons with rings on, perched on a ledge on a coastal cliff, Cornwall, UK, April.

Markus Varesvuo / Feral pigeon (Columba livia), Helsinki, Finland, February.

Markus Varesvuo / Feral pigeon (Columba livia), Helsinki, Finland, February.

Markus Varesvuo / Two Feral pigeons (Columba livia) perched, one with nesting material in its beak, Helsinki, Finland, February.

Markus Varesvuo / Feral pigeon (Columba livia) flying with nesting material in its beak, Helsinki, Finland, February.

Markus Varesvuo / Feral pigeon (Columba livia) flying with nesting material in its beak, Helsinki, Finland, February.

Laurent Geslin / People walking passed flock of Rock doves / Feral pigeons (Columba livia) feeding, London, UK

Laurent Geslin / Rock dove / Feral pigeon (Columba livia) pair interacting, London, UK

Laurent Geslin / Rock dove / Feral pigeon (Columba livia) landing, London, UK

Laurent Geslin / Flock of Rock doves / Feral Pigeons (Columba livia) in London, UK

Laurent Geslin / "Do not feed the Pigeons" sign in Trafalgar Square, London, UK

Laurent Geslin / Young girl chasing pigeons (Columba livia) in Trafalgar Square, London, UK

Laurent Geslin / Man feeding Feral pigeons / Rock doves (Columba livia) London. UK.

Laurent Geslin / Feral Pigeon / Rock dove (Columba livia) flying. London. UK.

Laurent Geslin / Feral pigeon / Rock dove (Columba livia) male displaying, London. UK.

Laurent Geslin / Feral pigeons / Rock doves (Columba livia) London. UK.

Laurent Geslin / Feral pigeon / Rock dove (Columba livia) London. UK.

Laurent Geslin / Feral pigeons / Rock doves (Columba livia) beside pedestrian, London. UK.

Laurent Geslin / Feral pigeon / Rock dove (Columba livia) displaying, London. UK.

Milan Radisics / Pigeon (Columba livia) faeces on Budapest Metro sign, Budapest, Hungary, March 2009

Ernie Janes / Rock Doves (Columba livia) in flight. Hunstanton, Norfolk, March.

Ernie Janes / Rock Dove / Feral Pigeon (Columba livia) in flight. Hunstanton, Norfolk, April.

Ernie Janes / Fan-Tailed Pigeon (Columba livia) in flight with nesting material. Norfolk, November.

Guy Edwardes / Feral Pigeon (Columba livia) drinking from Fonte Gaia (Fountain of Joy) fountain. Piazza del Campo, Sienna, Italy, September.

Guy Edwardes / Feral Pigeon (Columba livia) drinking from Fonte Gaia (Fountain of Joy). Piazza del Campo, Sienna, Italy, September.

Alan Williams / Rock Doves (Columba livia) perched on roof of disused building Islay Scotland, UK, October

Markus Varesvuo / Feral Pigeon (Columba livia) flying over ice, Helsinki, Finland, February

Juan Manuel Borrero / Illustration of Rock Pigeon (Columba livia). Pencil and watercolor painting.

Markus Varesvuo / Feral Pigeon(Columba livia) Helsinki, Finland, December

Markus Varesvuo / Feral Pigeons (Columba livia) one with nesting material in beak, Helsinki, Finland, January

Markus Varesvuo / Feral Pigeon (Columba livia) flying with nesting material, Helsinki Finland January 2006

Markus Varesvuo / Feral Pigeon (Columba livia) drinking, Helsinki Finland, February

Markus Varesvuo / Feral Pigeon (Columba livia) carrying nest building material, Helsinki, Finland, February

Markus Varesvuo / Feral Pigeon (Columba livia) flock flying over field near Helsinki, Finland, September

Markus Varesvuo / Feral Pigeon (Columba livia) pair at bird feeder of oat stems, Helsinki, Finland, December

David Tipling / Hindu grain seller for pigeon (Columba livia) feeding for religious purposes, with pigeons being fed in the background, Jodphur, India

David Tipling / Religious feeding of pigeons (Columba livia) by Hindus, Jodphur, India

David Tipling / Religious feeding of pigeons (Columba livia) by Hindus, Jodphur, India

David Tipling / Religious feeding of pigeons (Columba livia) by Hindus, Jodphur, India

David Tipling / Young girl feeding feral pigeons (Columba livia) in park, Tonbridge, Kent, summer

David Tipling / Woman feeding feral pigeons in front of Gandan Monastery, Ulan Bator, Mongolia, September

David Tipling / Man feeding feral pigeons (Columba livia) in front of Gandan Monastery, Ulan Bator, Mongolia, September

David Tipling / Feral Pigeon (Columba livia) Trafalgar Square, London, May

David Tipling / Feral pigeon (Columba livia) flying, London, March

Konrad Wothe / Feral pigeons (Columba livia domesica) mating on roof, Germany, September

Konrad Wothe / Feral pigeons courting (Columba livia domestica) Germany, September

Bertie Gregory / 2020VISION / Feral pigeon (Columba livia) perched on scaffolding, Bristol, England, UK, June.

Terry Whittaker / 2020VISION / Man with dog feeding Feral pigeons (Columba livia), with one perched on his head, Regents Park, London, England, UK, April

Terry Whittaker / 2020VISION / Man with feral pigeons (Columba livia) perched on his head, Regents Park, London, England, UK, April

Terry Whittaker / 2020VISION / Man with dog feeding Feral pigeons (Columba livia), Regents Park, London, England, UK, April

Terry Whittaker / 2020VISION / Man with dog feeding Feral pigeons (Columba livia), with some perched on his head, Regents Park, London, England, UK, February

Terry Whittaker / 2020VISION / Young woman feeding Feral pigeons (Columba livia), Manchester, England, UK, February. Model released.

Terry Whittaker / 2020VISION / Young woman feeding Feral pigeons (Columba livia), Manchester, England, UK, February. Model released.