Deterapigeon.com/pigeon control.htm

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Pigeon Control

Description: Manufacturer and supplier of patented anti roosting pigeon spikes or bird spikes are simply glued onto any window, pipe or ledge where pigeons roost; the dense pattern of protruding pins make it impossible for pigeons to land, encouraging them to go elsewhere without hurting them. Proven industry-standard method of protecting buildings from pigeons and provide the ultimate pigeon deterrent or bird deterrent.
--http://www.deterapigeon.com/pigeon_control.htm