Pigeons (Columbidae)
Pigeons are the number one pest bird throughout the world. They are responsible for most of the bird fouling, spreading fungal infection and after a prolonged period, even causing structural damage to buildings.
At the very least, pigeon mess on corporate signage is bad for brand image.
There are many techniques available to prevent pigeons from nesting, including spiking ledges, roof tops, walls and other perches or using netting to prevent the birds from entering buildings, courtyards, rooftops etc.