Abstract: A bird defense system for a dock system. The bird defense system consists of a series of support arms that are mounted to the stringers of the dock. The support arms are manually attached to the stringer and have an adjustable height support rod that allows the user to set the height of the bird defense system. At the end of the support rods are hollow tubes that accommodate a cord that is threaded through each support arm creating a perimeter around the dock preventing birds from landing or hoping on the top surface of the dock.