Bird Deterrence Nuisance birds' cause not only a visual and noise problem, but also their droppings can cause building damage through direct chemical action.  Birds can be a threat to human health passing on serious diseases to humans, such as salmonella, listeria spp or cause allergic alveolitis.     UDPG can provide a comprehensive humane bird control service to:   Prevent birds perching or roosting on your property   Expel them from specific locations. Clear accumulated fouling, safely.