From a distance, birds may appear peaceful, kind, and some may even find them cute. Well, not until they start nesting in your home. See, birds can cause more harm than you may realize. For one, they can cause severe damages to the structure of your home. Their droppings can corrode concrete and metal. Plus, they are very unsightly. Their feathers or the debris from their nests can cause clogging in your drains and gutters as well.