In New York and New Jersey, common nuisance bird species include pigeons, starlings, and sparrows. They can cause damage by nesting in or on buildings, leaving droppings that corrode surfaces, spreading disease, and creating noise disturbances. Signs of infestation include large numbers of birds roosting or nesting, excessive droppings, and damage to buildings. Treatment options include deterrents like netting, spikes, or sound devices and cleaning and disinfecting affected areas.