On the other hand, loud ultrasound is irritating on the birds and discourages nesting and roosting. Some models impact birds above a region of about an acre (4000 sq. meters). Polish community health officials tracked an epidemic of Salmonella to pigeons. Pigeon excrement can also be routinely contaminated by E. https://cristian7bjrz.digiblogbox.com/56575966/5-essential-elements-for-installing-a-pigeon-repellent-in-arar