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

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

Bertie Gregory / 2020VISION / Adult male Peregrine falcon (Falco peregrinus) returning to his nest with Feral pigeon (Columba livia) prey, Bristol, England, UK, June.

Bertie Gregory / 2020VISION / Juvenile male Peregrine falcon (Falco peregrinus) in flight chasing his parent who has Feral pigeon (Columba livia) kill in claws, Bristol, England, UK, June.

Bertie Gregory / 2020VISION / Adult male Peregrine falcon (Falco peregrinus) food passing a Feral pigeon (Columba livia) to his offspring, Bristol, England, UK, June.

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 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...

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

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

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, 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

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

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

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

Laurent Geslin / Man with a feral pigeon (Columba livia) on his shoulder. Trafalgar Square, London, UK

Laurent Geslin / Feral pigeon (Columba livia) on its nest with two chicks, above the streets of Geneva, Switzerland

Laurent Geslin / Feral pigeon (Columba livia) in flight, London, UK

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

Dave Watts / Feral pigeons (Columba livia) roosting on a temple roof, Durbar Square, Kathmandu, Nepal, 2019.

Will Watson / Flocks of Mute Swans (Cygnus olor) and Feral Pigeons (Columba livia) during 2019 floods, River Severn, Worcester, England.

Klein & Hubert / Domestic pigeons (Columba livia) mating on farm roof France.

Klein & Hubert / Domestic pigeons (Columba livia) in courtship on farm roof France.

Klein & Hubert / Domestic pigeon (Columba livia) in courtship flight in blue sky France.

Klein & Hubert / Domestic pigeons (Columba livia) mating on farm roof France.

Klein & Hubert / Domestic pigeons (Columba livia) in courtship on farm roof France.

Klein & Hubert / Domestic pigeon (Columba livia) in courtship on farm roof France.

Klein & Hubert / Domestic pigeon (Columba livia) in courtship flight in blue sky France.

Klein & Hubert / Domestic pigeon (Columba livia) in courtship flight in blue sky France.

Edwin Giesbers / Rock dove / pigeon (Columba livia), four standing on ledge in rockface. Cyprus. April.

Edwin Giesbers / Rock dove / pigeon (Columba livia) perched on rockface. Cyprus. April.

Nick Upton / Wild rock dove / Rock pigeon (Columba livia) walking on coastal cliff, Costa de Papagayo, Lanzarote, Canary Islands, February.

Nick Upton / Wild rock dove / Rock pigeon (Columba livia) walking on coastal cliff, Costa de Papagayo, Lanzarote, Canary Islands, February.

Konrad Wothe / Rock dove (Columba livia) male displaying, Germany. June

Robin Chittenden / Feral pigeon (Columba livia) group perching on bricks, Suffolk, England, UK. September.

Edwin Giesbers / European bison (Bison bonasus) with flock of Rock dove (Columba livia) Zuid-Kennemerland National Park, the Netherlands, Reintroduced species.

Edwin Giesbers / European bison (Bison bonasus) with flock of Rock dove (Columba livia) Zuid-Kennemerland National Park, the Netherlands, Reintroduced species.

Edwin Giesbers / RF -European bison (Bison bonasus) herd resting with Rock pigeon (Columba livia) flock. Zuid-Kennemerland National Park, the Netherlands. Reintroduced species. (This image may be licensed either as ri...