Even so, loud ultrasound is irritating to the birds and discourages nesting and roosting. Some models have an effect on birds over a region of about an acre (4000 sq. meters). Pigeon management can be quite a challenging job because of the abundance of these birds in cities. But, quite https://cash7ep42.answerblogs.com/31677345/installing-a-pigeon-repellent-in-arar-an-overview