When pigeons are in trees, water features or fields, it is often impossible to treat the area with products that will provide long-term results. Trapping is a desirable alternative considering the legal ramifications associated with shooting and poisoning. Trapping takes 3 weeks, at the most 4. If a contractor tells you they charge by the month, they are not looking out for your best interests. You should also be concerned if they are not suggesting any preventative measures. Contact The Pigeon Guy for more details.