What lived in those trees must now find a new tree the lived in your yard must get a new place to live a life. Bird droppings also can create maintenance issues with rooftop ventilators, AC units, skylights, panels and rainwater runoffs. https://Wiki.insidertoday.org/index.php/Reasons_For_Hiring_A_Pest_Control_Company_For_Your_Treatment_Of_Domestic_Pests