However, loud ultrasound is irritating to the birds and discourages nesting and roosting. Some units have an affect on birds in excess of a region of about an acre (4000 square meters). In lots of situations, medication is necessary to treatment the illnesses contracted from pigeon droppings As well as https://mpowerdirectory.com/listings519107/the-fact-about-installing-a-pigeon-repellent-in-arar-that-no-one-is-suggesting