Birds create a menace to roofs and floors of the building by landing, nesting and roosting. Bird nests cause machinery damage via blockage. Their droppings cause spoilage to the vehicles and automobiles. They affect the aesthetic value of the property. Pigeons (Columba livia) carries a wide range of bacteria such as Salmonella (causes food poisoning) and Ornithosis – which is mistaken for flu in human. Myna droppings (Sturnus vulgaris) from a large roosting flock provides a good medium for pathogenic fungi.