Pigeons belong to columbidae species (Columba), they are found on all continents. They feed on seeds but also waste.
Ring dove (Wood Pigeon) is the most important species classified as pests in the countryside; it most often attacks the colza, Protein and leguminous crops.
City pigeons are often overpopulation with very acidic droppings which causes deterioration of houses or buildings; it is often in this case the wood Pigeon.
Pigeons also create problems on aviation safety (presence on Airfields).