Post and wire systems have been used in Europe for over 20 years. Easily installed with an extensive selection of accessories for virtually any architectural configuration, the system is effective against pigeons and gulls, but not starlings or sparrows. The system is also effective against aquatic birds in open areas such as ponds or parking lots. While the most versatile and least expensive of all the available systems, installation of trip wires is an artistic endeavor and requires a modicum of mechanical know-how. Netting, last but not least, is the most effective barrier available to deny all species of birds a roosting or breeding site on any structure.
Netting is strong, weatherproof, effective against all species, and is relatively inexpensive.
However, considerable skill is required for permanent installation. Nets are very inconspicuous and can be color-coded to effect a virtually invisible finished product. In addition to an integrated bird management system, basic bird control involves elimination of nests, food, water and shelter. Selection of the correct system or combination thereof is critical in preventing re-roosting. After all, they're not called homing pigeons for nothing.