Brent Stephenson / Atoll Fruit-dove (Ptilinopus coralensis) perched on a branch. Takapoto, Tuamotus, French Polynesia, November.

Laurent Geslin / Wood pigeon (Columba palumbus) drinking beside a discarded coke can in Paris, France

Laurent Geslin / Wood pigeon (Columba palumbus) standing by a discarded coke can in Paris, France

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

Mark Carwardine / Pink pigeon (Columba / Nesoenas mayeri) threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Mark Carwardine / Pink pigeon (Columba / Nesoenas mayeri) threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Mark Carwardine / Pink pigeon (Columba / Nesoenas mayeri) threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Mark Carwardine / Pink pigeon (Nesoenas / Columba mayeri) threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Laurent Geslin / Wood pigeon (Columba palumbus) on grass near busy road, Paris, France. April.

Laurent Geslin / Wood pigeon (Columba palumbus) perched on the arm of a classical stone statue, urban park, Paris, France, April.

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.