Paul D Stewart / 'Martha' the last passenger pigeon, (Ectopistes migratorius), who died Cincinnati Zoo, September 1st, 1914. This portrait of her published in March 1915 as the Frontispiece to William Hornaday's 'The...

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

Terry Whittaker / 2020VISION / Feral pigeon (Columba livia) on ground, with people's feet in the background, South Bank, London, England, UK, September. Did you know? In the 16th Century England pigeon guano was the only source of...

Terry Whittaker / 2020VISION / Feral pigeons (Columba livia), Manchester, England, UK, January. Did you know? Pigeons only have 40 taste buds whereas humans have around 10,000.

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

Paul Hobson / Feral Pigeon / Rock Dove (Columba livia) on city street. Sheffield, UK.

Bernard Castelein / Rock doves (Columba livia), sitting in front of typical wall paintings of Shekhawathi region, Shekhawathi, Rajasthan, India

Bernard Castelein / Rock dove (Columba livia), sitting in front of typical wall paintings of Shekhawathi region, Shekhawathi, Rajasthan, India

Laurent Geslin / Male Feral pigeon (Columba livia) touching female with his beak. Paris, France

Laurent Geslin / Flock of Feral pigeons (Columba livia) in front of the Eiffel tower at dusk, Paris. France, November .

Laurent Geslin / Flock of Feral pigeons (Columba livia) feeding on bread in an urban street, in the rain, London, England, UK, October 2008.

Laurent Geslin / Flock of Feral pigeons (Columba livia) feeding on bread, landing / taking off in a busy urban street, London, England, UK, October 2008.

Wild Wonders of Europe / Hermansen / Rock dove (Columba livia) on cliff top, Saltee Islands, County Wexford, Republic of Ireland, June 2009

Michael Hutchinson / Feral pigeon / rock dove (Columba livia) perched on top of Empire State Building with view of Manhattan below, New York City, USA

Michael Hutchinson / Feral pigeon / rock dove (Columba livia) perched on top of Empire State Building with view of Manhattan below, New York City, USA

Kim Taylor / Pigeon-garden fantail / Rock Dove {Columba livia} flying. Captive. UK.

John Downer / Feral pigeon (Rock Dove) flying, UK

John Downer / Feral pigeon (Rock dove) flying; photographed during filming of BBC tv series Lifesense

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.

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

Terry Whittaker / 2020VISION / Young woman feeding a Feral pigeon (Columba livia) perched on her arm, Manchester, England, UK, February. Model released.

Terry Whittaker / 2020VISION / Young woman feeding a Feral pigeon (Columba livia) perched on her arm, Manchester, England, UK, February. Model released.

Nick Upton / Low angle view of Feral pigeons (Columba livia) on lake shore and Coots (Fulica atra) swimming in St. James's Park, with people and Whitehall buildings in the background, London, UK, January.

Fergus Gill / 2020VISION / Feral Pigeons (Columba livia) feeding out of a man's hand. Glasgow, Scotland, December.

Markus Varesvuo / Feral pigeon (Columba livia) in flight, Helsinki, Finland, January

Markus Varesvuo / Feral pigeon (Columba livia) in flight carrying twig in beak, Helsinki, Finland, January

John Downer / Cameraman Alan Hayward filming imprinted Feral pigeon / Rock dove (Columba livia) from a moving car as it drives along a beach for 'In-Flight Movie', UK, 1986

Martin Willis / White-quilled Rock-Pigeon (Petrophassa albipennis), Kununurra, Western Australia, Australia

Martin Willis / Chestnut-quilled Rock-Pigeon (Petrophassa rufipennis) small flock sunning, Kakadu, Northern Territoy, Australia

Paul Hobson / Feral Pigeon / Rock Dove (Columba livia) on city street seen through bycicle wheels. Sheffield, UK.

Paul Hobson / Rock Dove / Feral Pigeon (Columna livia) in flight. Yorkshire, UK.

Paul Hobson / Feral Pigeon / Rock Dove (Columba livia) huddled before fountain. Sheffield, UK.

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

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

Philippe Clement / Feral pigeons / Rock doves (Columba livia) Belgium, April.

Staffan Widstrand / Galapagos Dove (Zenaida galapagoensis) perched on rock. Punta Suarez, Espaniola, Galapagos, Ecuador, April.

Stephen Dalton / A pair of Barred Ground Doves / Zebra Doves (Geopelia striata) on a rock. Seychelles, March.

Mark Carwardine / Feral pigeon (Columba livia) portrait, showing very similar plumage to rock dove, Gloucestershire, UK, March

Mark Carwardine / Feral pigeon (Columba livia) showing very similar plumage to rock dove, Gloucestershire, UK

Ernie Janes / White fantail doves (Columba livia) on tower, UK, March

David Tipling / Man feeding Feral pigeons (Columba livia) in front of Gandan Monastery in Ulan Bator, Mongolia, September 2008

Laurent Geslin / Feral pigeon portrait (Columba livia) in Paris, France

Laurent Geslin / Male and female Feral pigeons (Columba palumbus) touching beaks. Paris, France

Laurent Geslin / Male Feral pigeon (Columba livia) with wings spread, mating with female. Paris, France

Laurent Geslin / Male and female Feral pigeons (Columba livia) sitting together on a wall. Paris, France

Laurent Geslin / Male and female Feral pigeons (Columba livia) touching beaks. Paris, France

Laurent Geslin / Male Feral pigeon with wings spread (Columba livia) mating with female, Paris, France

Jasper Doest / Rock Dove (Columba livia) pair in wall opening, Alfaro, Spain

Laurent Geslin / Flock of Feral pigeons (Columba livia) in front of Notre Dame, at dusk, Paris. France, November .

Laurent Geslin / Flock of Feral pigeons (Columba livia) landing / taking off, urban street, London, England, UK, October 2008.

Laurent Geslin / Flock of Feral pigeons (Columba livia) taking off as jogger approaches, urban street, London, England, UK, October 2008.

Hanne & Jens Eriksen / Rock dove {Columba livia} close-up, Oman, March

Hanne & Jens Eriksen / Rock dove {Columba livia} male on barren ground, Oman, March

Stephen Dalton / Tumbler pigeons / Rock doves (Columba livia) on corrugated iron roof, UK

Wild Wonders of Europe / Geslin / Rock pigeon (Columba livia) perched in hole in brick wall in the Vatican garden, Rome, Italy, March 2010

Patricio Robles Gil / Speckled pigeon {Columba guinea} pair on rock, Kruger NP, South Africa

Andrew Walmsley / Rock pigeon (Columba livia) portrait, Christchurch, New Zealand, April

Laurie Campbell / Child feeding feral pigeons / rock doves {Columba livia} Princes Street, Edinburgh, Scotland, UK, March, Model released

Wild Wonders of Europe / Hermansen / Rock dove (Columba livia) on cliff top, Saltee Islands, County Wexford, Republic of Ireland, June 2009

David Tipling / Fantail Dove {Columba livia} in Dovecote, Cornwall, UK

Michael Hutchinson / Feral pigeon / rock dove (Columba livia) perched on top of Empire State Building with view of Manhattan below, New York City, USA

Michael Hutchinson / Feral pigeons / rock doves (Columba livia) perched on top of Empire State Building with view of Manhattan below, New York City, USA

Winfried Wisniewski / Rock Dove (Columba livia) flying, Netherlands

Roger Powell / Feral Pigeon / Rock dove {Columba livia} display-flying at nest site, Alcantara, Spain

Jose B. Ruiz / Collared dove (Streptopelia decaocto) perched on rock, Alicante, Spain

Jose B. Ruiz / Collared dove (Streptopelia decaocto) perched on rock, Alicante, Spain

Jose B. Ruiz / Collared dove (Streptopelia decaocto) perched on rock, Alicante, Spain

GEORGETTE DOUWMA / Feral pigeons / Rock doves (Columba livia) perched on fence in park. London, UK

GEORGETTE DOUWMA / Feral pigeon / Rock dove (Columba livia) sitting on fence, London, UK

Inaki Relanzon / Rock Dove (Columba livia), two fledgling chicks in nest, South Spain